- #1
de1979
- 1
- 0
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?
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?