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Post by dee on Feb 28, 2016 8:28:32 GMT -5
Cosina clone often had f1.7 lenses .
I wonder if this was a marketing ploy , 'cos the difference from f 1.8 must be minimal ?
dee
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Post by philbirch on Feb 28, 2016 14:37:43 GMT -5
Different suppliers and different optical formulae probably
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Stephen
Lifetime Member
Still collecting.......
Posts: 2,718
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Post by Stephen on Feb 28, 2016 21:15:48 GMT -5
Designs can be stretched a bit, but usually not to good effect, and after all the open aperture is rarely actually used, and if the light demands it, then the light is going to be marginal, but of course the shot may need an atmospheric softness. The cheaper F1.7 lens were indeed a bit of a ploy, mainly for marketing, but it does not mean they were bad lenses.
Stephen
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