does this lens have any autofocus problem on a classic Canon 5d (MK I)?
447426
I don't own the 5D. Shot with it in the past. As far as I know, there shouldn't be any issues at all. Sigma 85mm is spot on.
1857083
the Micro lens adjustment is a nice feature on the 7D. I own the Canon 50mm f/1.4 USM, and it always front focuses slightly on my 60D. An adjustment of +4 on the lens did the trick. That being said, of all my other lenses I have no focusing issues on the 60D. So in summary, the Micro lens adjustment is a nice feature, but you can always use manual focus on certain lenses to ensure proper focus. Furthermore, a good lens will last you decades, it is the better investment to get the most out of either the 60D or 7D.
117621
I'm sure it would be fine. I have a K5 which has the same sensor size and I get great shots. In auto focus it sometimes hunts, but I just throw it in manual. The glass is excellent.
1564625
I used this lens for one year until yesterday without any problems. Just yesterday I am experiencing the same issue: quite focus hunting when zoomed out at 70+ and when it stops it is not on focus! Any idea?
677224
Yes and no. ALL Canon dslr's (except the 1DX) will not auto focus if the lens speed (max aperture) is faster than f5.6. The 1.4x extender will convert your 4-5.6 lens to 5.6-7.8. So, at the apertures above 5.6 you won't get reliable if any auto focus. You can use the extender if you are willing to manually focus.
1855393
It will not autofocus. If you purchase this lens you will have to manually focus all of your shots
686000
Yes. I have a 7D (and a 40D) and use this lens all the time. It's still a terrific quality lens and unbeatable value, IMO. (I also have the Canon 10-22mm, which is a fantastic lens, but more a specialty lens.)
1343873
I am using the same model lens compatible with Canon 6D. This has HSM (Hyper Sonic Motor) which ensures quiet and high speed autofocus. This is my favorite lens.
1981823
I love my combo of this lens and my OM-D E-M5. I have no problems. Focus is plenty fast for me. That lens-body combo takes my highest quality pics.
773885
It is a tiny bit noisy compared to a Canon 1.2 but in reality it's just fine. The auto focus easily detects the focus point but manual focus is still better.
678439
My EOS-1Ds Mark III arrived about two weeks ago around the first of Dec. Certainly there are no focus problems on any lens I've tried, and I have 8 or 10. In fact, one can "tweak" the focus for each lens. I've not seen the need for this rather technical step, however, and should I, then I'll do it professionally with correct charts, lighting and so on. It can be redone, though, so any errors can be corrected.
282219
I have used this lens with Canon 20D & 5D MkII to shoot mainly Air Shows at EAA Oshkosh & some Road Race's at Road America but I'm very happy with this len's, as others have said this lens does likes light so you can keep the shutter speed up to catch those fast moving subjects.
903182
Even though it does not auto focus, I still use this lens a lot, even for video!
95245
It probaby won't autofocus for you, and you may need a lot of light at 5.6. I think it doubles the amoutn of light needed. That shouldn't be a problem for a stellar camera like the D7000. I have one and it does a great job in ultra low light.
117908
The autofocus is a little noisy, if that's what you mean by 'lens mechanism'. No other issues that I can think of.
1253598
Can't answer directly, but I have used this lens with a 6D, and have gotten pin sharp images with typically spectacular Canon color rendition. The AF is almost instantaneous. The image quality, IS, and a more substantial look and feel would make me choose this lens over the older version every time.
1634146
Pentax K-5II autofocus is excellent. I locked myself in a dark closet to see how good it was and I was able to focus and shoot pretty fast. I moved from a Pentax K20D and had the same issue with the camera... loved the pics but the autofocus sucked. I know people who have moved from the Nikon 60D and Cannon 5D to the Pentax K-5ii impressed by the AF speed. Hope this helps. Good luck!