K-7 CD-AF and Sigma 70-200mm HSM II: Pentax SLR Talk Forum: Digital Photography Review

K-7 CD-AF and Sigma 70-200mm HSM II

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Forum	Pentax SLR Talk
Subject	K-7 CD-AF and Sigma 70-200mm HSM II [SIMILAR]
Posted by	ManuH [PROFILE] [GALLERY]
Date/Time	02:49:20, 16 July 2009 (GMT)


I just acquired a Sigma 70-200mm f/2.8 HSM II (wanted the 60-250 but not at double the price and one stop less...). Unfortunately my copy frontfocus a lot, and not even a -10 correct it completely but that's not the issue. I tried the Liveview CD-AF and... it seems impossible to find the focus, or it gives up completely or gives a lock on a completely blurry picture, so blurry that I cannot tell if it's front or backfocusing. Anyway maybe it's related to the slight FF (especially visible at f/2.8, at f/4.0 it's mostly gone) but I wanted to know if other people have tested this lens or other Sigma HSM lenses with the K-7 Liveview CD-AF. -- Manu http://farm3.static.flickr.com/2101/1572581597_ffd4ca4a5b_m.jpg http://flickr.com/photos/ensh/ Réflex Pentax: http://www.flickr.com/groups/pentaxfr/ My PPG: http://www.pentaxphotogallery.com/home#section=ARTIST&subSection=1312871&subSubSection=3929608

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