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Jupiter 12, 35/2.8, Contax RF/Kiev mount
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PostPosted: Tue Oct 31, 2017 5:08 pm    Post subject: Jupiter 12, 35/2.8, Contax RF/Kiev mount Reply with quote
Sure not a lens for pixel peeping, but a nice small walkaround one on the Sony A7ii;


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PostPosted: Tue Oct 31, 2017 6:12 pm    Post subject: Reply with quote
Looks very nice! How do you get the edges so sharp? On my a7 it is very soft, I can't replicate this performance.


PostPosted: Tue Oct 31, 2017 7:05 pm    Post subject: Reply with quote
blotafton wrote:
Looks very nice! How do you get the edges so sharp? On my a7 it is very soft, I can't replicate this performance.


Stopping down to f8/f11 and then you have to carefully focus, the lens has field curvature, so you have to balance the center and border sharpness. Even with this the results are less then good somerimes when looking at 100% magnification, but for web viewing it s ok.


PostPosted: Tue Oct 31, 2017 7:47 pm    Post subject: Reply with quote
tomasg wrote:
blotafton wrote:
Looks very nice! How do you get the edges so sharp? On my a7 it is very soft, I can't replicate this performance.


Stopping down to f8/f11 and then you have to carefully focus, the lens has field curvature, so you have to balance the center and border sharpness. Even with this the results are less then good somerimes when looking at 100% magnification, but for web viewing it s ok.


+googolplex

Overlooked way way too often, usually blamed on lens...

Thank you! Thank you! Thank you!


PostPosted: Wed Nov 01, 2017 10:19 pm    Post subject: Reply with quote
Excellent work! Like Dog

I have replaced my Jupiter-12 with a T coated Zeiss-Opton Biogon 2.8/35. The same basic lens design, but Zeiss was forced to redesign the huge rear element so that the lens could be used on the smaller Contax 2a and 3a cameras. The smaller Zeiss-Opton lens works on Sony's APS-C cameras, where the J-12 doesn't.


PostPosted: Thu Nov 02, 2017 8:45 am    Post subject: Reply with quote
newst wrote:
Excellent work! Like Dog

I have replaced my Jupiter-12 with a T coated Zeiss-Opton Biogon 2.8/35. The same basic lens design, but Zeiss was forced to redesign the huge rear element so that the lens could be used on the smaller Contax 2a and 3a cameras. The smaller Zeiss-Opton lens works on Sony's APS-C cameras, where the J-12 doesn't.


Thank you!
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