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|| SportsShooter.com: Member Message Board Tamron Lens Incompatible With Canon Mark III and Mark IV? Alan Herzberg, Photographer Elm Grove | WI | USA | Posted: 5:26 AM on 11.10.10 ->> A friend of mine has a son and daughter who each play college basketball. He borrowed my Mark III to photograph his son and daughter this past weekend. He has a Tamron 70-200 2.8 lens. When he put the lens on the Mark III, it would not autofocus. When he returned my camera, I tried to get the lens to work, but had no luck. We then tried the lens on my Mark IV and had the same problem - no autofocus. Both cameras work fine with my Canon lenses and his Tamron lens works fine with his Canon 7D. There's no AF/MF switch on the Tamron lens, so it wasn't that we had the lens set to MF. We cleaned the contacts on both his lens and my cameras. We tried setting the camera AF for the shutter button and then the back button. After that we gave up and had a couple beers. Even that did not fix the problem, although it did not bother either of us as much as before. Has anybody heard of this problem? Any ideas why that Tamron lens won't work with my Mark III and Mark IV?  This post is:  Informative (0) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Philip Johnson, Photographer Garland | TX | USA | Posted: 8:53 AM on 11.10.10 ->> I have heard about this problem with third party lens. You need to send it into Tamron and have them put a new chip in the lens so that it will communicate with the newer camera bodies. Just call Tamron tech support and I'm sure they can explain it to you.  This post is:  Informative (1) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Israel Shirk, Photographer, Assistant Boise | ID | US | Posted: 1:51 PM on 11.10.10 ->> Tamron and Sigma don't license the technology that canon uses to communicate between their cameras and lenses; instead, they reverse-engineered it. As a result, when a camera is made to use certain features that tamron and sigma weren't aware of before, the tamron/sigma lenses can't figure out what the camera body is trying to tell it.  This post is:  Informative (1) | Funny (0) | Huh? (0) | Off Topic (0) | Inappropriate (0) |   Definitions Alan Herzberg, Photographer Elm Grove | WI | USA | Posted: 11:06 PM on 11.10.10 ->> Thanks!  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: Tamron Lens Incompatible With Canon Mark III and Mark IV? Thread Started By: Alan Herzberg Message: Member Login: Password: Return to --> Message Board Main Index

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