Interessanter Workaround für A33/A55:
http://forums.dpreview.com/forums/re...ssage=36293281
Zitat:
If you slide the body AF/MF switch to MF. mount the Sigma lens, and then slide the body switch to AF the Sigma lens stops down and autofocuses properly. With my fast and old Sigma 75-200mm the lens works properly on an A700, but the lens rarely initializes the aperture properly if I mount it on the A33 with the body AF switch in AF.
As I-R pointed out, when the aperture does not engage the aperture remains stopped down, and in my 5-pin lens you can't AF and the aperture is reported incorrectly. Apparently with the current 8-pin interface the Sigma behaves a little differently. When I slide the body switch to MF before mounting the Sigma, then switch to AF the Sigma lens initializes aperture and focus properly and it has continued to work until I turn off the A33.
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Zitat:
This in fact may be a Sigma mechanical problem with their A-mount copy and not a chip issue. If so Sigma is being disingenuous in saying they can't fix older lenses. They probably just don't want that expense. OR perhaps it is a combination of a mechanical issue and the lens firmware chip.
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Es wird in dem Post gemutmaßt, dass es sich auch um ein mechanisches Problem handeln könnte oder eine Kombination. Mir fällt da spontan ein, dass es Sigmas gab, die im Objektivdeckel oder an der Kamera festhingen, weil der Blendenhebel danben vorbeirutschte.