While I've never had to do it, I have read of a number of people sending their canon bodies along with their sigma lens to Sigma for calibration. The track record for getting good results this way seems very good.
HI... I also had problems with my 70d, 24 105 L attached... Upon reading this thread, I found out that something is common (to my own opinion of course), back and front focusing. At my first try with the new body, I felt great but the deeper I go to observe the performance, mis focusing (at a low level) is noticed... I tried to make adjustments too (W+5... T+7) and it went well, having sharper images, but yet not as sharp as at f6.3 when in f4... I think this is something Canon has to resolve. Just what they are doing right now in fixing autofocus problems with the 1 DX which I see is their priority at the moment... Hope they can fix problem with just a firmware update... Best regards to us all, 70d users.
How are your other lenses?
The same with 70-300 and 50mm 1.8... 50mm has the worst one at 1.8... Thanks for the advice, Ill try it tomorrow...
I agree with you. I want to love this camera, but I have the same problem.I'm thinking about returning it.
I think that you are right. It must only be happening with some bodies, as mine is incredibly accurate and consistent. I do only use AI Servo (with back button AF) though.
I suppose this is wide open. These results are good.
Have you tried using AI servo even for static stuff with the Sigma?
A clarification, don't get me wrong here. Camera says with highlighted point that it is focusing on the subject yet, the result comes out that it is not focused on that subject at all.
I think Canon messed up again. This camera is not for you if you ever want to use Full Auto mode, which may not be a big deal for some of us, most of us stuck with this camera before you realize this and your return period is over
So, Advice for you, DO NOT use AUTO mode.
Good Luck.
And my advice (which may seem a bit harsh) is, if you really want to use Auto mode all the time, don't bother with a DSLR. One fundamental issue (actually a real benefit) with larger sensor cameras vs. most point and shoots is that the DOF is much thinner. Auto mode works fine in a P&S because so much of the frame is in focus... any errors in the area that the camera chooses for focus are hidden because it's all basically sharp anyway. With the larger sensor comes thinner DOF. This makes errors in selecting the right focus point much more visible. Thinner DOF is a good thing... it enables you to isolate your subjects from the background rather than making the image appear cluttered. But you have to know how to control it using the settings you have available.I Agree,but again, the MFA does NOT work in auto mode. Only in P (not sure) ,Av,Tv,M modes.
Also the auto focus mode has large size issues. center focus (single point) works fine, even zone focus is mostly fine. If you are using 19-point automatic, only god be with you.
I think Canon messed up again. This camera is not for you if you ever want to use Full Auto mode, which may not be a big deal for some of us, most of us stuck with this camera before you realize this and your return period is over
So, Advice for you, DO NOT use AUTO mode.
Good Luck.
I am perfectly happy with 70D as I hardly use Auto mode. I even use Manual Focus most of the time anyway. however, it is those times when your photo moments are quick and does not allow for enough time to use manual focus, I fall back to auto focus. And those are the moments you need your camera to work for you. I never said using it all the times. Whenever I use this camera (lately more, since it is new) I make sure not to use 19-point focus mode.And my advice (which may seem a bit harsh) is, if you really want to use Auto mode all the time, don't bother with a DSLR. One fundamental issue (actually a real benefit) with larger sensor cameras vs. most point and shoots is that the DOF is much thinner. Auto mode works fine in a P&S because so much of the frame is in focus... any errors in the area that the camera chooses for focus are hidden because it's all basically sharp anyway. With the larger sensor comes thinner DOF. This makes errors in selecting the right focus point much more visible. Thinner DOF is a good thing... it enables you to isolate your subjects from the background rather than making the image appear cluttered. But you have to know how to control it using the settings you have available.I Agree,but again, the MFA does NOT work in auto mode. Only in P (not sure) ,Av,Tv,M modes.
Also the auto focus mode has large size issues. center focus (single point) works fine, even zone focus is mostly fine. If you are using 19-point automatic, only god be with you.
I think Canon messed up again. This camera is not for you if you ever want to use Full Auto mode, which may not be a big deal for some of us, most of us stuck with this camera before you realize this and your return period is over
So, Advice for you, DO NOT use AUTO mode.
Good Luck.
Allowing your camera to select where to focus based on it's "best guess" is asking for problems. If you must use a more automatic mode and would prefer not to learn the fundamentals of exposure, shutter speed, etc., then use P mode. At least there you'll have the ability to select a single focus point and control where the camera will focus.
So, bottom line, Canon didn't mess up in any way IMHO. I think purchasing the wrong tool for the job is more of an issue with the buyer.
Sure..gimme a hand
