Q: Who makes Navitar lenses? Where?

We design and assemble most Navitar lenses at the Navitar manufacturing facility located at 200 Commerce Drive, Rochester, New York, USA.

Q: Why should I use a lens attachment to increase the magnification if it reduces the working distance? Why not change the lens adapter instead?

Resolution is determined by the numerical aperture (N.A.) at the object side of the lens system. Changing the lens adapter will increase the magnification but have no effect on the resolution. Increasing the resolution can only be accomplished by adding a lens attachment.

Q: How do I choose the correct components to get a specific magnification at a specific working distance?

The best way to choose the correct parts is to use Navitar's online lens calculator, the Optical Wizard.

Q: How do I mount a lens?

We offer mounting brackets that clamp on the adapter barrel. Motorized lenses have optional flat plates for mounting. We can also create custom mounting fixtures as required.

Q: Can you shorten the optics of a lens?

Yes, we offer a variety of adapter tubes of different lengths. These can be used to change the overall object to image distance. Navitar also provides 90 degree bends in the object and image spaces using both mirrors and Non-inverting Right Angle (NIRA) prisms.

Q: Why can’t I get high magnification and good depth of field?

To get adequate resolution, most high magnification systems also have a high numeric aperture (N.A.). Depth of field is inversely proportional to N.A. If the system has an iris, you may increase the depth of field by closing down the iris, but this will result in less resolution.

Q: What is the resolution of your lens system?

Resolution is a function of the lens system’s numerical aperture (N.A.). The formula to calculate resolution in line pairs per mm is 3000 x N.A.

Q: How do I determine the focal length I require?

Object size and camera format determine magnification. Magnification and working distance determine lens type. Please refer to the lens calculators for fixed focal lengths and the respective charts for zoom systems and Precise Eye systems.

Q: What is the difference between depth of field and depth of focus?

Depth of field is the viewable thickness envelope at the object plane. Depth of focus is the image thickness envelope at the image plane.

Q: Are your optics A/R (anti-reflective) coated?

Yes.

Q: How can I get more depth of field?

Use a slower lens (higher F/#, lower N.A.). Or, if available, stop down the system with an iris, but be aware that resolution will diminish.

Q. What is the proper way to clean my HemiStar lens?

A. You can use the following glass cleaning solvents and instruction to clean the outside glass of your lens:

• Acetone: Acetone can be used alone on optics if there is no heavy dirt.
• Isopropyl Alcohol (preferred)

Instructions:

• Using a small piece of lens tissue wrap it around the swab/ tweezers, soak the wipe using acetone or alcohol, applying a gentle uniform pressure wipe slowly starting in the center and working your way out to the edge.
• Wiping slowly allows the solvent to evaporate without streaking. Remember, slow and steady cleans the optic. Glass-cleaning solvents will streak, so always use wipes with a solvent, because dry wipes can scratch optical surfaces.

Q: Why would I need a different lens from the one that came with my projector?

Video or data projectors only give a limited projection screen image size. By exchanging the unit's lens (LCD or DLP) for an ancillary (replacement) lens the projector can be placed further or closer to the projection screen. The advantage of this is that the size of the image can be kept within the confines of your screen from a greater distance while putting the data/video projector in a more convenient position at the rear of the room. Or, the projector can be placed closer to the screen to provide a larger image area in a smaller room. If your projector does not give you the image size you really want then you may need a new lens.

Q: How do I install my LCD Lens?

Installation instructions can be found on our website and are specific to your projector make and model.

Q: What do I do if my lens needs to be repaired?

Please contact Navitar or your Dealer regarding instructions for return. We urge our dealers to return all products to our factory for any repairs. Unauthorized disassembly will result in voiding the product warranty. Many product repairs require specialized knowledge and tools/equipment. Your Navitar representative can provide you with a return materials authorization number (RMA#) that is required for product return/repair.

Q. How do I calculate what size lens I require ?

If you need to calculate the correct lens size you require, please use the following formula for a very close approximation. If you have any questions, please call and speak to one of our engineers.

Lens Focal Length = Projection Distance x LCD Panel Size (diag. or width)
                                                 Screen Size (diagonal or width)

First, you must know the following information:
1. Screen size in inches (diagonal or width).
2. Projector LCD panel size in inches (diagonal or width).
3. Projection distance in inches (measured from the front of the video projector housing to the screen).

It is very important that you be consistent. If you use the diagonal screen size measurement, then you must also use the diagonal measurement for the projector LCD panel size. If using screen width, then use the LCD panel size width. If you are working in inches, then you need to do all of your calculations in inches.

You can convert the lens size to millimeters at the end. Please note the following information:
Screen Diagonal x 0.8 = Screen Width
LCD Diagonal x 0.8 = LCD Width
1 Foot = 12 Inches
1 Inch = 25.4 Millimeters

Example: You have an 80’ projection distance from the screen to the front of the LCD projector housing. The screen is 10’ wide & the LCD has a 1.3" diagonal.

Lens Focal Length = Projection Distance x LCD Size (diagonal or width)
                                                   Screen Size (diagonal or width)

Lens Focal Length (Calculated in Inches)
                                     = (80’ x 12") x (1.3" x 0.8) = 960" x 1.04" = 8.32"
                                                    10’ x 12"                     120"

Lens Focal Length (Calculated in Millimeters)
                                          = (80’ x 12" x 25.4) x (1.3" x 0.8 x 25.4mm)
                                                          (10’ x 12" x 25.4mm)
                                          = 24,384mm x 26.416mm = 644,127.74mm = 211mm
                                                         3,048mm                  3,048mm

For this application, we recommend the 6-9" zoom lens, model 819MCZ900.

Q. If my image is 10 feet wide, how high will it be?

An easy way to determine image height is to take the image width and divide it by its aspect ratio. Theaspect ratio for standard video is 1.33:1.
Image Height = Image Width = 10’ = 7.5’ (7’6" or 2,286mm)
                         Aspect Ratio 1.33
The aspect ratio for HDTV and most "letterbox" formats is 1.77:1, therefore a 10 foot wide HDTV imagewill be 5’8" high

Q. How do I convert a diagonal measurement into width?

Just as most TV sizes are given in diagonals, the same is true of LCD panel sizes. This is why we multiply the LCD panel size (a diagonal measurement) by 0.8 (4x3 standard format) or 0.87 (16x9 wide screen format) to determine the "Aperture," which is the "Width" measurement.

Standard Format (4x3 : 1)
Width (or Aperture) = Diagonal Measurement x 0.8 

Wide Screen Format (16x9 : 1)
Width (or Aperture) = Diagonal Measurement x 0.87 

Q. Why do some lenses only work on certain projectors?

The most common reason for this is due to the physical internal and external designs of the projector itself. For example, the position of the LCD panel or electronic components inside the machine are simply not compatible with all lenses. The design of the outside projector cover can also determine whether or not some larger lenses can be used with that particular projector model.

Q. Is it difficult to install a new LCD lens in a projector?

Installing a new lens is relatively simple. There is no disassembling involved and no heavy electronics to take apart. In fact, many projector manufacturers are now designing their projectors to make it easier to remove the prime lens.

Installation instructions are included with each NuView lens sent out. You can also find instructions onour website under the Documents/Drawings tab associated with the lens selected. If you have any doubts, contact your dealer for the name of an authorized service center or trained professional in your area, or you can contact the Navitar directly.

Q. Will I lose all of my remote control features?

All NuView lenses are manual lenses, that is, you must focus or zoom the lens by hand (your power zoom and power focus functions will be disabled). If your projector has a lens shift function, you will retain this feature. For fixed installations, the picture size and focus need to be set only once and readjustment is not necessary. Set it and forget it!

Q. At what distance will my lens focus?

Most NuView lenses will focus as close as 3 to 4 feet in front of the projector and all lenses are set to focus to infinity, therefore focusing at long distances will not be a problem.

Q. What do these terms mean?

Zero Offset Most LCD projectors have a built-in angle of projection, usually upwards a few degrees. A "zero offset" or "on axis" lens projects straight out in front, so it is necessary to place the projector in a position that is perpendicular to the center of your screen. This is typically the case when using wide-angle and fixed lenses.

MCZ (in lens part number): Multi-Coated Zoom and MCL: Multi-Coated Lens . Our coating process increases the brightness, contrast ratio and color saturation of our "Xtra Bright" lenses.

Prime Lens The "prime lens" is the factory installed, manufacturer’s lens that comes with your projector.

Q. What is a ScreenStar® and how do I use it?

A Navitar ScreenStar is a conversion lens for video projectors. It is simply placed in front of theprojector's standard lens allowing users to easily change the picture size or throw distance for almostany size format video projector. If needed, slide the ScreenStar from left to right to capture the fourcorners of the projected image. To enlarge your image size, rotate the projector zoom lens to wide-angle and use our 0.65X or 0.8X ScreenStar wide-angle conversion lens to increase your image by 20-50% from the same projection distance. To increase your throw distance, rotate the projector zoomlens to telephoto and use our 1.20X or 1.5X ScreenStar telephoto conversion lens. This allows you toplace your projector 20-50% farther away from the screen and maintain the same image width.

Q. Why would I choose a conversion lens instead of a replacement lens?

There are a variety of reasons for choosing a conversion lens instead of a replacement lens. Often,people who choose to use a conversion lens are working with a small format projector. Many of thesmall format projectors on the market today are too intricate to take apart and replace the prime lens,so a conversion lens is the best choice. Other projectors allow lens replacement, but many replacementlenses are physically too large for smaller format projectors.

Q. Why would I use an HD ScreenStar instead of a standard ScreenStar lens?

HD ScreenStar lenses preserve your HD projector image. The HD ScreenStar lenses have been speciallydesigned to convert the image without losing sharpness, color or brightness.

Q. What is considered a small format projector?

Navitar conversion lenses are often used with small format projectors. Here are a few of the smallformat projectors currently on the market (panel sizes are measured diagonally):

•     DLP format projectors: 0.55", 0.7", 0.8", and 0.9"
•     LCD small format projectors: 1.2", 1.0", 0.9", 0.8", 0.7", and 0.5"
•     DILA format projectors: 0.7"
•     LCOS format projectors: 0.9"

Q. Will a ScreenStar conversion lens work with every projector?

While a ScreenStar conversion lens should work with most projectors, the most common exception is aprojector where the prime lens sits too far inside the projector, away from the projector face. Closecoupling the ScreenStar with the prime lens will allow you to use the ScreenStar and prevent clippingthe corners of the projected image

Q. Will a ScreenStar conversion lens work with every projector?

While a ScreenStar conversion lens should work with most projectors, the most common exception is a
projector where the prime lens sits too far inside the projector, away from the projector face. Close
coupling the ScreenStar with the prime lens will allow you to use the ScreenStar and prevent clipping
the corners of the projected image.

Q. Can I use a ScreenStar conversion lens with my ceiling-mounted projector?

Yes. There is a ceiling mount adapter accessory available from Chief Manufacturing which allows you to
attach the ScreenStar lens to a Chief ceiling mount. (Call Chief at 1-800-582-6480 and ask for part # NAV1.)

Q. How do I calculate my new focal length using a Navitar ScreenStar lens?

A1. Use the following formula to calculate your new focal length using the Navitar SSW065 orHDSSW065 Wide-angle ScreenStar Conversion Lenses

Focal Length (FL)
FL x 0.65 = New Focal Length (with Conversion Lens)

Consider that your current focal length is 1.18-1.80" and you place a Navitar SSW065 Wide-angleScreenStar Conversion Lens in front of the projector's standard lens, your new focal length will be:

FL x 0.65 = New FL
1.18-1.80 x 0.65 = 0.76-1.17" New FL

Note: When the focal length ranges between two numbers, as in the example above, multiply eachnumber by 0.65 separately for your new focal length range using Navitar's Wide-angle Conversion Lens.

A2. Use the following formula to calculate your new focal length using the Navitar SSW08 or HDSSW08Wide-angle ScreenStar Conversion Lenses

Focal Length (FL)
FL x 0.8 = New Focal Length (with Conversion Lens)

Consider that your current focal length is 1.10-1.40" and you place a Navitar SSW08 Wide-angleScreenStar Conversion Lens in front of the projector's standard lens, your new focal length will be:
FL x 0.8 = New FL
1.10-1.40 x 0.8 = 0.88-1.12" New FL

Note: When the focal length ranges between two numbers, as in the example above, multiply eachnumber by 0.8 separately for your new focal length range using Navitar's Wide-angle Conversion Lens.

A3. Use the following formula to calculate your new focal length using the Navitar SST120 TelephotoScreenStar Conversion Lens

Focal Length (FL)
FL x 1.20 = New Focal Length (with Conversion Lens)

Consider that your current focal length is 1.10-1.40" and you place a Navitar SST120 TelephotoScreenStar Conversion Lens in front of the projector's standard lens, your new focal length will be:

FL x 1.20 = New FL
1.10-1.40 x 1.20 = 1.32-1.68" New FL

Note: When the focal length ranges between two numbers, as in the example above, multiply eachnumber by 1.20 separately for your new focal length range using Navitar's Telephoto Conversion Lens

.A4. Use the following formula to calculate your new focal length using the Navitar SST150 TelephotoScreenStar Conversion Lens

Focal Length (FL)
FL x 1.5 = New Focal Length (with Conversion Lens)

Consider that your current focal length is 1.18-1.80" and you place a Navitar SST150 TelephotoScreenStar Conversion Lens in front of the projector's standard lens, your new focal length will be:

FL x 1.5 = New FL
1.18-1.80 x 1.5 = 1.77-2.7" New FL

Note: When the focal length ranges between two numbers, as in the example above, multiply eachnumber by 1.50 separately for your new focal length range using Navitar's Telephoto Conversion Lens.

Q. How do I calculate my new image width using a Navitar ScreenStar lens?

A1. Use the following formula to calculate your new image width using the Navitar SSW065 orHDSSW065 Wide-angle ScreenStar Conversion Lenses

Image Width (IW)
IW x 1.5 = New Image Width (with Conversion Lens)

Consider that your current image width is 96" and you place a Navitar SSW065 Wide-angle ScreenStarConversion Lens in front of the projector's standard lens, your new, larger image width will be:
IW x 1.5 = New Image Width
96" x 1.5 = 144" New Image Width

A2. Use the following formula to calculate your new image width using the Navitar SSW08 or HDSSW08Wide-angle ScreenStar Conversion Lenses

Image Width (IW)
IW x 1.25 = New Image Width (with Conversion Lens)

Consider that your current image width is 80" and you place a Navitar SSW08 Wide-angle ScreenStarConversion Lens in front of the projector's standard lens, your new, larger image width will be:

IW x 1.25 = New Image Width
80" x 1.25 = 96" New Image Width

A3. Use the following formula to calculate your new image width using the Navitar SST120 TelephotoScreenStar Conversion Lens

Image Width (IW)
IW x 0.83 = New Image Width (with Conversion Lens)

Consider that your current image width is 80" and you place a Navitar SST120 Telephoto ScreenStarConversion Lens in front of the projector's standard lens, your new, smaller image width will be:

IW x 0.83 = New Image Width
80" x 0.83 = 67" New Image Width

A4. Use the following formula to calculate your new image width using the Navitar SST150 TelephotoScreenStar Conversion Lens

Image Width (IW)
IW x 0.67 = New Image Width (with Conversion Lens)

Consider that your current image width is 96" and you place a Navitar SST150 Telephoto ScreenStarConversion Lens in front of the projector's standard lens, your new, smaller image width will be:

IW x 0.67 = New Image Width
96" x 0.67 = 64" New Image Width

Q. How do I calculate my new projection distance using a Navitar ScreenStar lens?

A1. Use the following formula to calculate your new projection distance using the Navitar SSW065 orHDSSW065 Wide-angle ScreenStar Conversion Lenses

Distance (D)
D x 0.65 = New Distance (with Conversion Lens)

Consider that you currently place your projector at a distance of 13 feet from the screen. If you place aNavitar SSW065 Wide-angle ScreenStar Conversion Lens in front of the projector's standard lens, tomaintain the same image size, you'll be able to move your projector 33% closer to the screen. Your new,closer distance will be:

D x 0.65 = New Distance
13 ft. x 0.65 = 8.45 ft. New Distance

A2. Use the following formula to calculate your new projection distance using the Navitar SSW08 orHDSSW08 Wide-angle ScreenStar Conversion Lenses

Distance (D)
D x 0.8 = New Distance (with Conversion Lens)

Consider that you currently place your projector at a distance of 20 feet from the screen. If you place aNavitar SSW08 Wide-angle ScreenStar Conversion Lens in front of the projector's standard lens, tomaintain the same image size, you'll be able to move your projector 17% closer to the screen. Your new,closer distance will be:

D x 0.8 = New Distance
20 ft. x 0.8 = 16 ft. New Distance

A3. Use the following formula to calculate your new projection distance using the Navitar SST120Telephoto ScreenStar Conversion Lens

Distance (D)
D x 1.2 = New Distance (with Conversion Lens)

Consider that you currently place your projector at a distance of 20 feet from the screen. If you place aNavitar SST120 Telephoto ScreenStar Conversion Lens in front of the projector's standard lens, tomaintain the same image size, you'll be able to move your projector 20% farther away from the screen.Your new, longer distance will be:

D x 1.20 = New Distance
20 ft. x 1.20 = 24 ft. New Distance

A4. Use the following formula to calculate your new projection distance using the Navitar SST150Telephoto ScreenStar Conversion Lens

Distance (D)
D x 1.5 = New Distance (with Conversion Lens)

Consider that you currently place your projector at a distance of 13 feet from the screen. If you place aNavitar SST150 Telephoto ScreenStar Conversion Lens in front of the projector's standard lens, tomaintain the same image size, you'll be able to move your projector 50% farther away from the screen.Your new, longer distance will be:

D x 1.50 = New Distance
13 ft. x 1.50 = 19.5 ft. New Distance

Q. Can I use the ScreenStar lens with multiple brand and model projectors, or larger size (taller) projectors?

Yes. We offer an optional table stand with adjustable height and tilt, which allows compatibility with projectors of almost any size, shape, or height. This is great for AV rental dealers who deal with numerous brands and types of projectors. The Navitar part number is 1-16576. (Please note that you will need to purchase the corresponding adapter ring for your ScreenStar model.)

Q. How do I attach my ScreenStar lens to my projector?

There are four different options for attaching your ScreenStar Lens: A stabilizing leg comes standard with every ScreenStar lens. When using the ScreenStar on a table, with a typical small DLP or small format LCD projector, the stabilizing leg is all you'll need. It allows you to simply place the ScreenStar lens in front of the prime lens on your projector. (There is nothing to actually attach.). Another choice is the optional table mount which allows you to place the lens in front of the projector and easily adjust the height and tilt as required. Base holes allow for hard mounting the stand to a surface. If you plan to use your ScreenStar with a ceiling mounted projector, there are two ceiling mount adapter accessories available. Chief Manufacturing and Premier Mounts both offer ceiling mount adapters that allow you to easily attach your ScreenStar lens to a ceiling mounted projector. To order a Chief ceiling mount adapter, call Chief directly at 1-800-582-6480 or 1-952-894-6280 and ask for part #

NAV 1. To order the Premier Mounts ceiling mount adapter, contact Premier Mounts at 1-800-368-9700 or 1-714-528-2072 and ask for part # PP-NVT.
Finally, for large volume applications, Navitar would be happy to make a custom adapter allowing you to directly connect the ScreenStar lens to a specific model projector. Please call for details and minimum requirements.

Q. How far away from the projector do I place the ScreenStar?

The ScreenStar lens should be positioned directly in front of your projector's prime lens and placed as close to the prime lens as possible.

Q. Will my image be distorted if I add a ScreenStar lens?

No. Navitar ScreenStar lenses do not add any significant distortion.

Where can I get my Pixelink software?

Pixelink Capture software is a demonstration image capture application built around the Pixelink API and is available via web download. You can download the latest version here.

From where can I download a required driver for my Pixelink camera?

All drivers and software downloads are located here.

Where do I register or update the Software Development Kit (SDK)?

You can register by completing this form.

Is the Pixelink Software Development Kit (SDK) a necessity to use a Pixelink camera?

Pixelink USB 3.0 cameras are compliant with the ‘USB3 Vision Standard’. As such, you can develop your own camera applications using either the Pixelink Software Development Kit (SDK) or a 3rd party vision development platform that is also compatible with the USB3 Vision Standard. We continually test our cameras against a number of these platforms, including MATLAB (from MathWorks), LabVIEW (from National Instruments, using their IMAQdx drivers), and HALCON (from MVTec).

Is it possible to use Pixelink cameras in a Linux environment?

Yes, Pixelink has a Linux version SDK (API/Driver) to use with our USB 3.0 cameras. Our FireWire cameras can function on a Linux platform using DCAM compliant software and our Gigabit Ethernet cameras can function using GEV compliant software. Please download the correct Linux Version here as pertains to your Operating system.

Where can I download Capture OEM?

Capture OEM is integrated into Pixelink Capture and Pixelink SDK. You first need to download and install Pixelink Capture or the Pixelink SDK. You can then find Capture OEM on your desktop by selecting “Start”, and typing “Capture OEM” in the search bar, or using the following path “C:\Program Files (x86)\Pixelink\Capture OEM”

Where can I find the Pixelink Camera IP Address Assignment Tool?

Please visit this link in the Pixelink Knowledge Base for more information.

What are the differences between USB cameras and FireWire cameras?

The Universal Serial Bus (USB) 2.0 or 3.0 standards provide high bandwidth interfaces that are well-suited for digital imaging, and are well-established and popular serial interfaces in use. USB 2.0 or 3.0 ports are widely available on a variety of hardware platforms and systems. This availability maximizes system compatibility and minimizes the need for add-in PCI or PCI Express interface cards. More details can be found in the Pixelink Knowledge Base.

Do you sell other camera accessories and products as well?

Yes, we offer camera lenses and other accessories.

Q: Can Navitar design custom products?

Yes. Contact Navitar with your specific requirements and our expert engineering team will work with you to develop a custom solution to meet your needs. After discussing your specifications in detail, we will offer a solution that outlines system performance, operating trade-off, NRE charges, and estimate prototype and serial production costs.

Q: I need a solution that is just a little different from what I see in the catalog. What should I do?

Call your regional sales rep to discuss your application or feel free to complete our Contact Us form with details of your needs and we will contact you.

Q: Do you sell cameras?

Yes. Navitar acquired Canadian based camera manufacturer Pixelink and offers their full line of cameras. You may contact your Navitar Sales Representative for further information or call Pixelink directly at 1-800-521-5454 from within North America and +1-613-247-1211 from any international location.

Q: Can I use a C-mount lens on a CS-mount camera?

Yes, with the addition of a 5mm spacer. This compensates for the smaller flange distance designed into a CS-mount camera.

Q: I'm using a CCTV lens in my machine vision application. How can I improve the image quality without moving up to an expensive lens?

Use a CCTV lens designed for a larger format camera.

Q: Can you recommend a lens if I know my FOV, working distance, and camera?

Yes. Contact your local Navitar sales representative, who will be happy to determine the correct lens for your application. You can also use the following formula to determine the required focal length (FL) for your application: FL= CCD x WD/FOV.

Q: Do your CCTV lenses have set screws?

Most lenses come standard with set screws. Contact your local Navitar sales representative for additional information.

Q: What is C-Mount?

1” – 32T mounting thread with a 0.690” (17.53mm) flange distance.

Q: How do I put a filter on the front of my CCTV lens?

Most CCTV lenses come with female threads that accept standard filters. It may be necessary to purchase a “step-ring” to adapt to available filter sizes.

Q: What is the difference between the Zoom 6000 and 12X Zoom?

The 12X zoom has a higher N.A. and larger zoom range. The Zoom 6000 has a smaller profile. It is shorter than the 12X with a smaller outside diameter.

Q: What are the resolution capabilities of your zoom systems?

The cut-off frequency is generally 3000 x N.A. in line pairs/mm, in visible light.

Q: Why can't you use a 2/3" format camera with your 12X Ultra-zoom lens?

The 12X lens is designed for use with a ½” CCD. Systems used with sensors greater than ½” can show vignetting at lower magnification settings.

Q: Where can you mount clamps to the zoom lens?

Manual zooms have cylindrical flanges. Motorized zooms can be mounted with flat plates. Both manual and motorized zooms can be held using adapter clamps.

Q: How do I get a required magnification on my monitor with a video microscope system?

Total Magnification on Monitor =
(Lens Attach. Mag.) x (Zoom Mag.) x (Adapter Mag.) x (Cam/Monitor Mag.)

Q: How do I set the lens to stay in focus throughout the entire zoom range (setting the parfocality of the lens)?

INSTRUCTIONS FOR SETTING THE PARFOCALITY OF ZOOM LENS

    1.Zoom to the high magnification position (4.5X on the Zoom 6000, 7X on the 12X Zoom).

    2.Set the fine focus (if present) to center of the allowable movement.

    3.Adjust the working distance of the entire lens system to produce the best focus.

•         Do NOT change this position of the lens system for steps 4 and 5.

    4.Zoom to the low magnification position (0.7X on the Zoom 6000, 0.58X on the 12X Zoom)

    5.Adjust the rear conjugate (the distance from the rear of the lens to the camera’s sensor).

•         Some cameras have a focus screw to adjust this distance (see camera documentation).
•         Most Navitar adapter tubes have adjustable back ends to allow for this adjustment.
•         The adjustable lenses in Navitar’s adapter tubes are locked into place by a thumb screw on the adapter tube. Do NOT attempt to open the adapter tube to gain access to this lens.
•         When adjusting the optics, loosen the thumb screw only to the point where the optics move freely. If the screw comes free from the inner cell, it is difficult to get back into place properly.

    6.Check to see that the system now stays in focus throughout the entire zoom range travel.

Q: Can I attach an M25x0.75t micro objective to an UltraZoom?

All the M25 x 0.75t objectives will thread directly into our UltraZooms with use of the correct coupler. Zoom 6000 and 12X UltraZoom lenses include these couplers when ordered. Precise Eye lenses also require a coupler to attach objectives. Couplers are also included with Ultra PE.

Q: Can you help me calculate the magnification range when using Navitar 12X Ultra Zoom lenses with a Mitutoyo Objective lens of 5x or other infinity corrected objectives and an adapter of 2X?

To understand the magnification characteristics of the 12x UltraZoom, we must start with the magnification characteristics of the standard 12x system.

The magnification range of a 12X system with a 1X adapter and no lens attachment is 0.58X to 7.00X. Logically, one would assume that placing a 2X adapter on this system (above the zoom) would result in a doubling of the magnification yielding a magnification range of 1.16X to 14.00X and this is correct.

However, when a Mitutoyo objective is introduced the equation changes in two ways. The Mitutoyo objective was designed to function with a 200mm tube lens. The Navitar 12X is equivalent to a 178mm tube lens changing the multiplication factor to (178/200) .89. Additionally, to add the microscope objective to the 12X zoom we must remove the existing lens from the bottom of the zoom. The result is, essentially, the reduction of the magnification of the objective by ½. Therefore, if a 12X zoom is used with a 5X Mitutoyo objective and a 2X adapter the magnification range becomes:

(.58X to 7X)(2)(.9)(2.5) = (2.61X to 31.5X) resulting in a magnification range of 2.61X to 31.5X.

It should be noted that the magnification ranges listed on the web and in the catalogue will vary slightly as these values are directly from the design raytrace.

Q: What endurance can be expected from a Navitar motorized system?

The system wear characteristics are a function of operating speed. Navitar recommends that a complete cycle time not be less than 3 seconds.

Q: Does Navitar offer holders or clamps for their motorized systems?

A flat surface-mount option may be purchased for the 12X and Zoom 6000 systems. Alternatively, the user may affix the system by using a clamp placed on the adapter. Clamps shall NOT be applied in any location other than the adapter as this may cause interferences within the zoom system. Click here for mounting options.

Q: Does Navitar supply drivers for their motorized systems?

Yes, Navitar has gone to great lengths to make a complete motorized solution available for your zoom needs. We highly recommend that our motorized zoom systems be used in conjunction with our driver/control options. The options consist of either a board level or an enclosed driver. Both are computer controlled and an additional manual control box can be connected to any driver model. Additionally, Navitar will supply the source code for easy interface with existing equipment.

Q: Since Navitar has three different motor options (2-phase stepper, 5-phase stepper and DC servo with encoder) how do I select the proper system for my application?

It depends on your personal preference and requirements, as well as the following considerations: The 2-phase stepper and the DC servo have a smaller ‘footprint’ than the 5-phase stepper. However, the 5-phase provides the greatest resolution due to the decreased step-angle from the 2-phase system. Additionally, the 2-phase and 5-phase have ‘holding torque’ inherent in the stepper design. The 2-phase will tend to get warm to the touch where the 5-phase will not, so if temperature is an issue consider the 5-phase.

Q: Can you go from one position to the next position on your motorized lens without going to the home position?

Yes, you can turn off the “homing” feature if absolute magnification repeatability is not an issue. If, however, repeatability is an issue, drive the lens towards the home position and always approach your target location from the same direction (home) to omit the backlash in the system.

Q: How long can the cables be for your motorized zoom lens?

PC to Driver Communication
RS-232 Cables = 32 feet / 10 meters
USB Cables = 16.5 feet / 5 meters

Motorized Lens to Driver Communication
DC Encoded = 10 feet / 3 meters
2-Phase Stepper/HE = 10 feet / 3 meters
5-Phase Stepper/HE = 6.5 feet / 2 meters

Q: Which axis controls the zoom on your control box?

The zoom shall always be axis 1 and the fine focus shall always be axis 2.

Q: Are your zoom lenses telecentric?

The 12X Telecentric Zoom system allows users to reach a true telecentric condition to within less than 0.3° while maintaining constant perspective and magnification. This means that even if the object is slightly out of focus, the size of the image will not change. The 12X Telecentric Zoom provides field coverage from 50 mm down to 4 mm and the coaxial illumination allows clear viewing, even when working with mirror-like surfaces. Click here for details about our 12X Telecentric Zoom System.

Q: When would I need a telecentric lens?

If you are concerned about a shift in magnification with object distance. Or, if perspective error is unacceptable over a given field of view.

Q: Will using a telecentric lens improve my depth of field?

No, telecentricity will keep magnification constant through the depth of field. However, the focus will soften as with any lens. The depth of field will still be determined by the system's F/#.

Q: Do you sell lighting?

Yes, we offer a variety of lighting options for various applications. Click here for details about available lighting options.

Q: How bright is your LED Coaxial Illuminators?

Specific lumen output varies from LED to LED and is dependent on electrical current. For a list of full lumen specifications please refer to Luxeon technical Datasheet DS64 and DS65 https://www.philipslumileds.com/support/documentation/datasheets

Q: Can I use my own driver for the LED illuminators?

Yes, as long as you are aware of the electrical characteristics of the Luxeon REBEL LED. The Navitar Controller is a current-driven, pulse width modulation device, however end users can develop or utilize their own control method. Caution must be used as the LED’s are easily damaged by improper driving. In addition, typical current drive circuits will cause the color of the LED to vary with intensity. This can cause unexpected complications in many applications. Navitar's driver utilizes a circuit architecture that maintains consistent performance when changing intensity.

Q: What is the voltage of your power supply for the Coaxial LED Illuminator and Ring Light?

• Navitar Coaxial LED Illuminator = 12 VDC
• Ring Light = 5 VDC

Q: Do your fiber bundles fit power supplies from different manufacturers?

Navitar fiber bundles typically fit into power supplies with 0.5” or 0.72” diameter fiber receptacles. Custom couplers can be designed to fit other power supplies.

Q: What are the lifetimes for the Navitar LED systems?

Lifetime for solid-state lighting devices (LEDs) is typically defined in terms of lumen maintenance—the percentage of initial light output remaining after a specified period of time.

Philips Lumileds projects that cool-white, neutral-white, warm-white, green, cyan, blue and royal-blue LUXEON Rebel products will deliver, on average, 70% lumen maintenance (B50, L70) at 50,000 hours of operation at a forward current of 700 mA. This projection is based on constant current operation with junction temperature maintained at or below 135°C.

Philips Lumileds projects that red, red-orange and amber LUXEON Rebel products will deliver, on average, 70% lumen maintenance (B50, L70) at 50,000 hours of operation at a forward current of 350 mA. This projection is based on constant current operation with junction temperature maintained at or below 110°C.

Q: What type of lens is used inside of the Navitar's Coaxial Illuminator system?

A 19°, 20mm circular frosted lens is ideally suited for our full line of 20mm Rebel Star LEDs when used with a matching 20mm lens holder. Manufactured from lens quality polycarbonate, this lens has a 83% transmission efficiency, is UL rated and can operate up to 125°C.

The frosted front surface of this lens provides better beam averaging, resulting in a smoother distribution of light.