"D7100 & SIGMA COMPATIBILITY" Tue 19-Mar-13 03:45 PM by billD80
Before people had D7100's in their hands, KR mistakenly posted on his site about some of his readers having D7100/Sigma lens compatibility problems.
I'm convinced he was referring to the D7000 (which DID have some Live View issues with SOME Sigma lenses, that required new firmware). I own 2 of the affected lenses (made BEFORE the D7000 was released, and had the firmware updated for the D7000...
I've now tested my Sigma 150/2.8; 8-16mm; and Tamron 17-50/2.8 (non OS/VR edition). ALL work perfectly on the D7100, using the viewfinder focus, and LiveView modes.
In Live View, AF-S, single point mode, it sounds like the camera sets and re-sets focus, but the focus is dead-on.
In regular mode the focus is fast and dead-on (seems faster than LiveView).
My Sigma 50/1.4 also appears to be fine, compatibility wise, but it's not in my hands right now to double-check the LiveView aspect.
Now, if someone has Sigma lenses made BEFORE the D7000 was released, and didn't get the D7000 firmware, I don't know what their results will be on the D7100.
Sigma lenses made AFTER the D7000 was out (with that firmware), may well be totally fine on the D7100.
#3. "RE: D7100 & SIGMA COMPATIBILITY" In response to Reply # 2
That's really good news, thanks. I've been posting about this issue elsewhere on here and can now send my 50-500mm OS and 105mm OS to Sigma for re-chipping, so I can use them on the V1 where they don't work. Sigma now have a fix and guess they will work on the D7100 after reading your comments.