canon7d-sync to lens

jc55 said:
Do you have to sync your lens to the camera?Using my canon70-200 on the 7d is ok,but seem to have a focusing problem with sigma150-500[its ok on 40d].any ideas?:thinking:
thank you
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As Sigma reverse engineer their lenses onto the current (when released) bodies you run the risk that it wont work on a body released after the lens was manufactured. I believe later Sigmas (hopefully yours is) can be re-chipped by Sigma, best to give them a call.
 
My Sigma 150-500 which is a year old works fine with my 7D, is yours not focussing at all or is it just back/front focussing a bit. I assume the contacts are clean.
 
if it is not focussing right you can micro-adjust it. It's in the custom functions menu and you can adjust the front or back focussing by 20 points. I've done this with 5 out of my 6 lenses and now they all work great
 
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