一定范围下，光圈越小细节表现越清晰。。。。。。
negative...be aware of diffraction
use optimum aperture instead if conditions permit
negative...be aware of diffraction
你这理论哪里来的？从没听过。BTW，哪个镜头能有F0.7？我是井底蛙，闻所未闻。
zeiss made 50mm/0.7 for 35 mm cameras before
this is the only general purpose photography lens that i know with F number at 0.7
there are lenses with apertures even larger than F/0.7, they are built for special purposes though
the theoritical limit for lens designed for use in air is around f/0.7
there are lenses with apertures even larger than F/0.7, they are built for special purposes though
the theoritical limit for lens designed for use in air is around f/0.7
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