A Navitar ScreenStar is a conversion lens for video projectors. It is simply
placed in front of the projector's standard lens allowing users to easily
change the picture size or throw distance for almost any size format video
projector. If needed, slide the ScreenStar from left to right to capture the
four corners 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 zoom lens to telephoto and use our 1.20X or 1.5X ScreenStar
telephoto conversion lens. This allows you to place 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 the small 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 replacement lenses 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 specially designed 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 small format 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 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 # NAV 1.)
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 or HDSSW065 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-angle ScreenStar 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 each number 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 HDSSW08 Wide-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-angle ScreenStar 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 each number 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 Telephoto ScreenStar 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 Telephoto ScreenStar 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 each number 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 Telephoto ScreenStar 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 Telephoto ScreenStar 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 each number 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 or HDSSW065 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 ScreenStar Conversion 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 HDSSW08 Wide-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 ScreenStar Conversion 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 Telephoto ScreenStar 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 ScreenStar Conversion 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 Telephoto ScreenStar 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 ScreenStar Conversion 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 or HDSSW065 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 a Navitar SSW065 Wide-angle ScreenStar Conversion
Lens in front of the projector's standard lens, to maintain 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 or HDSSW08 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 a Navitar SSW08 Wide-angle ScreenStar Conversion
Lens in front of the projector's standard lens, to maintain 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 SST120 Telephoto 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 a Navitar SST120 Telephoto ScreenStar Conversion
Lens in front of the projector's standard lens, to maintain 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 SST150 Telephoto 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 a Navitar SST150 Telephoto ScreenStar Conversion
Lens in front of the projector's standard lens, to maintain 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.
Q. How do I get an answer to a question that isn't listed here?
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