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These were made for use in rear screen projection TV sets in conjunction with our fresnel lenses.
Keep in mind that your fresnel is going to be held by some kind of frame.
I checked all around, studied up on the differences in fresnel lenses and finally decided on the F550 lens from 3Dlens.com.
The diameter of the hole is equal to the diameter of the largest complete circle on your fresnel lens .
Wiko replacement fresnel lenses have long been known for their superior quality.
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