7D low light AF... Canon vs Sigma std zoom

Started Aug 20, 2011 | Discussions thread
dougr
Regular MemberPosts: 392
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Re: 7D low light AF... Canon vs Sigma std zoom
In reply to dougr, Aug 21, 2011

OK... went out and bought the Sigma today after trying it in the store. So far, so good. The focus feels a bit faster than the 15-85 I sold (probably should given the difference in zoom range), but AF speed was not really the problem for me anyway, more accuracy and shutter speed/noise limitations. Anyway, good percentage of keepers on the first day, but have not really tried in poor lighting. will update when I do. Everything else said about the lens appears to be true... extremely sharp in the center from 2.8, very sharp at the edges from 2.8, a little soft in the corners at 2.8... sharp everywhere by f4. good contrast, bokeh and build. colors appear to be a tad warm compared to the canon lenses I've owned, but I like that about the Sigmas, so no issue for me. I think the corner softness at 2.8 at 17 may be a bit of field curvature as well, but I've done no formal tests as yet.

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