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Sigma APO DG 70-300mm 1:4-5,6 sometimes does not af(Auto-Focus)on Canon Rebel XTi in macro, with extension tubes almost never.


Answers :

I think you should use the manual focus for best results. the autofocus might not provide the best results at most times.
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Sigma APO DG 70-300mm 1:4-5,6 sometimes does not af(Auto-Focus)on Canon Rebel XTi in macro, with extension tubes almost never.


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I use a Quantaray lens af ld 70-300mm 1:4-5.6 tele-macro(1:2)@62 with my Canon eos Digtal Rebel xti. I have used the camera and the lens together very well for about a year and a half. Just recently with this lens set aat normal and the camera set at af(auto focus)the lens trys to focus and will continue to search for the correct focus setting with out taking the picture. Also the lens appears to be darker when I look through the viewer. I have a Canon EFS18-55mm lens which is operating correctl


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I bought digital Canon EOS Rebel XT two years ago, and I have really big problem with AF. I got one half of the pictures fuzzy. Sometimes the green light is on, I took the picture and it is fuzzy. Next shot is fine. I never have this kind of problem with Canon Rebel ( not digital). Now I can't rely on Auto Focus at all. Please explain to me where is a problem. Thanks, Irene


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