>>2695189 >>2695190 This is for radio waves, calling that thing an optical lens is a bit of a stretch, it's like comparing a satellite dish to a solar reflector. There are lenses that are designed to focus light (radiation) beyond the visible spectrum and visually they appear fully opaque, but are actually transparent to the bandwidth that they're designed to focus.
>>2695267 Air itself lacks a high enough index of refraction for this to be feasible after a point, the next step would be to fill all the empty space inside a lens with liquid. There is a limit to how much can be done on the lens-side alone, even then some photolithography lenses were so big they could poke through two floors of a lab.
>>2695231 >>2695266 This. The only time it would change is if you had it one an APS-C body. But that would only change field of view (focal length) and the depth of field (f/stop) not the transmission of light (t/stop). Putting your Noctilux on an a6000 with a speed booster will make it preform as if it was on an m240.
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