Fresnel lens optics

  • Thread starter de1979
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Hello :)
I search for some specific info about fresnel lenses.

I bought few so called "fresnel lenses" to play with light in my photography studio.
I have both real fresnel lens (wide) and just magnifical foil (narrow).

I want to project some pattern, so I put fresnel lens in front of studio reflector, and in the between I put some object, like lace fabric. The goal is to get sharp shadow, projected pattern on the wall.

Questions:

1) what's the formula for distance between reflector, object to project and the fresnel lens? I assume it is related to fresnel lens focal length.

2) What exactly happen when I join few lenses together? I was able to do it only with the magnificial foil but I noticed it works better.

3) What if I cut fresnel lens to pieces? it looks flat, but normal lens is not flat and half of the lens shouldn't work :) is fresnel lens special here?
 

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