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|| SportsShooter.com: Member Message Board Strange focus problem Thomas B. Shea, Photographer Pearland/Houston | TX | USA | Posted: 5:45 PM on 12.11.10 ->> Have any of you had this problem. When I shoot horizontally on AF with my Canon Mark III the images are soft, but when shooting vertically they are tack sharp. This sucks I just got my camera back from CPS.  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Chuck Liddy, Photographer Durham | NC | USA | Posted: 6:17 PM on 12.11.10 ->> you might have an element shifting in the lens....what lens is it?  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Thomas B. Shea, Photographer Pearland/Houston | TX | USA | Posted: 6:45 PM on 12.11.10 ->> It does it with all my lenses. My 16-35, 24-105 and 70 200. All Canon L glass  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Kevin Novak, Photographer, Assistant Bel Air (Baltimore) | MD | USA | Posted: 7:03 PM on 12.11.10 ->> Poor connection on electrical contacts on the body's lens mount?  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Mark Peters, Photographer Highland | IL | USA | Posted: 7:11 PM on 12.11.10 ->> You might consider checking to see if all the screws on the lens mount ring on the body are tight.  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Eric Canha, Photographer Brockton | MA | United States | Posted: 9:44 PM on 12.11.10 ->> Is it a high mileage body? My bet would be that the secondary mirror hinges or hing holes are worn out. Thus when the camera is tilted the secondary mirror flips up ever so slightly and distorts the image being sent to the AF sensors. I had a similar issue on a D3 that was about to be returned "no problem found" from the shop. I called and discussed the issue with service and that afternoon they called back to tell me that the holes that the AF mirror hinges on were worn and elliptical and just enough to be intermittent and not easily detected.  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Add your comments... If you'd like to add your comments to this thread, use this form. You need to be an active (paying) member of SportsShooter.com in order to post messages to the system. NOTE: If you would like to report a problem you've found within the SportsShooter.com website, please let us know via the 'Contact Us' form, which alerts us immediately. It is not guaranteed that a member of the staff will see your message board post. Thread Title: Strange focus problem Thread Started By: Thomas B. Shea Message: Member Login: Password: Return to --> Message Board Main Index

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