Fresnel Lens to put Smartphone Screen at "Infinity"? (Birding without Multifocals)
Hi everyone,
Just a quick thought: Has anyone ever tried to put a Fresnel lens in front of a smartphone screen to put it at optical infinity?
My idea is to work around the need to use multifocals to access the bird guide and the reporting app on the smortphone while birding.
Distance glasses (monofocals, or whatever you'd call them) work much better with the scope and with binoculars, but it's sort of inconvenient to have to switch glasses to be able to read the smartphone screen.
Back in the last millenium, I've seen Fresnel lenses used with cathode ray tubes to allow relaxed viewing of the screen by focusing them to infinity, so the technology has been used before (though in a less mobile context
Regards,
Henning
Hi everyone,
Just a quick thought: Has anyone ever tried to put a Fresnel lens in front of a smartphone screen to put it at optical infinity?
My idea is to work around the need to use multifocals to access the bird guide and the reporting app on the smortphone while birding.
Distance glasses (monofocals, or whatever you'd call them) work much better with the scope and with binoculars, but it's sort of inconvenient to have to switch glasses to be able to read the smartphone screen.
Back in the last millenium, I've seen Fresnel lenses used with cathode ray tubes to allow relaxed viewing of the screen by focusing them to infinity, so the technology has been used before (though in a less mobile context
Regards,
Henning
