Attention Tamron 24-70 VC owners

Started Jul 28, 2012 | Discussions thread
Horshack
Veteran MemberPosts: 4,233
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Re: Thanks. Appears your copy has the issue as well
In reply to TAFB, Jul 29, 2012

TAFB wrote:

Yes, focus is spot on between 50-70mm. I have significant back focus at 24mm. Could you please let me know if you have any focus shift at 24mm vs. 70mm?

I just tested both focus shift and focus accuracy on mine at 24mm and 70mm. Focus shift is when the plane of focus changes from wide-open to stopped down (aka, spherical aberration, to make sure we're using the same terminology). Focus accuracy is self explanatory. I don't see any focus shift between f/2.8 and f/8 at either 24mm or 70mm...and focus accuracy at both ends is perfect when tested on my D5100 at a distance of 5 feet and 15 feet.

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