Hello!
I have a little different question for this board. I am currently collecting parts for a DIY projector. The problem I have is finding a projection lens that meets these requirements:
1. A viewing circle large enough to "see" a 17" (diag) LCD screen
2. A focal length between 480mm and 550mm
3. A lens diameter large enough to "see" a light arc 27mm long going through first a 220mm FL fresnel and then a 550mm FL fresnel (so the arc would be about 68mm by the time it gets to the projection lens)
4. Relatively inexpensive to find on either ebay or a surplus, etc...
My set up goes: Bulb -> 220mm (maybe 330mm) fresnel -> 550mm fresnel -> LCD -> Projection lens
My basic question is: Does a process (large format) lens exist with a viewing circle of 440mm+, a focal length of 480mm, and a lens diameter of 80mm+?
Thanks for any info you can provide!
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