Tamron 70-200mm VS USD focus issues

Started 6 months ago | Discussions thread
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ovlov
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Tamron 70-200mm VS USD focus issues
6 months ago

Hello!  I recently picked up a Tamron 70-200mm VS USD lens to use on my 6D.  I've noticed that at 70mm the focus is slightly off.  I ran it through FoCal and got a MFA number of +6 at 70mm.  This value seems okay if my subject is within 10 ft.  If the subject is beyond that, the subject is slightly out of focus again.  Using contrast detect will produce a tack sharp image however.  Getting something far away to appear in focus requires a MFA value of -3.

At the long end of the lens there are no such issues.  It's quite sharp no matter the subject distance.  I am using a MFA of -3 at 200mm.  I also own a Canon 70-200mm f2.8 lens.  I've experienced no focus issues whatsoever with it.

Is this normal behavior for the Tamron or do I have a dud is what I'm wondering.  Anyone else shoot with this lens?

Canon EOS 6D
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