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Forums > Back > Sigma's lousy lens and it's ugly diamond-shaped bokeh (50mm f1.4 ART, Canon full frame)
Scythels
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#16
07-07-2014, 02:04 AM
Sorry, I'm very late.

 

The diamond shaped reproduction is likely a result of pinched optics, basically a lens being held in place too tight and causing a physical change in the element. 

 

re: "You don't get astigmatism shapes when you are that defocussed"

 

Astigmatism is present at all focus depths, onion ring bokeh is one manifestation of astigmatism.

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Sigma's lousy lens and it's ugly diamond-shaped bokeh (50mm f1.4 ART, Canon full frame) - by Scythels - 07-07-2014, 02:04 AM

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