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Forums > Back > next PZ lens test report: Sigma AF 50mm f/1.4 EX HSM DG (full format)
Yakim
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#31
06-07-2010, 11:00 AM
[quote name='Klaus' date='03 June 2010 - 09:02 PM' timestamp='1275598966' post='157']

"Residual spherical aberrations" - the lens suffers from focus shifts when stopping down.

The focus information is obtained at max. aperture so it's slightly off at other settings. At close focus distances this is a relevant problem.



RSAs are not so uncommon in this class.

[/quote]



Apparently mine had focus shift even wide open. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='Tongue' /> In fact, I sold it just because it was so annoying. Even calibration didn't work. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='Big Grin' />



Happy shooting,

Yakim.
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next PZ lens test report: Sigma AF 50mm f/1.4 EX HSM DG (full format) - by Yakim - 06-07-2010, 11:00 AM

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