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This video presents side-by-side comparisons of two Biotar design lenses from 1950 and 1975 to discuss which is the better lens.
Here are time links to different sections:
00:00 Introduction
01:06 Carl Zeiss Jena Biotar 58mm f2
02:03 Helios 44-2
03:19 Swirls and sharpness
07:37 Colours, contrasts and flares
10:44 Minimum focus distances
11:55 Conclusions
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