Gavjenks
TPF Noob!
- Joined
- May 9, 2013
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- Iowa City, IA
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I am considering either trying a plastic DSLR fresnel lens like in the back of rear projection TVs, or one of the ones they use for studio lighting, that doesn't have the stipling on the back of it to make it soft.
I'm well aware that this will have all kinds of terrible aberrations. What I'm wondering is just if anybody has tried this at all compared to homemade normal lenses, using for example lenses from surplusshed.com ?
The goal is to attempt to make a hilarious ~1000mm, f/0.8 lens that can maybe resolve enough to vaguely actually identify things in photos (i.e. "there mayyyy be a building in this photo" levels of resolution, if lucky). Or if not that, then just regular types of lenses.
However, if somebody has tried this and fresnel lenses are vastly worse than uncoated surplus crown glass lenses of equivalent power (to the point of not being able to make out anything, even with a reasonable FL at f/8 or something), then I may not bother.
I'm well aware that this will have all kinds of terrible aberrations. What I'm wondering is just if anybody has tried this at all compared to homemade normal lenses, using for example lenses from surplusshed.com ?
The goal is to attempt to make a hilarious ~1000mm, f/0.8 lens that can maybe resolve enough to vaguely actually identify things in photos (i.e. "there mayyyy be a building in this photo" levels of resolution, if lucky). Or if not that, then just regular types of lenses.
However, if somebody has tried this and fresnel lenses are vastly worse than uncoated surplus crown glass lenses of equivalent power (to the point of not being able to make out anything, even with a reasonable FL at f/8 or something), then I may not bother.