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<blockquote data-quote="DonnieZ" data-source="post: 502126" data-attributes="member: 40831">As another poster alluded to, there could be an issue with the Sigma lens and the D7100.When I was doing research into buying the Sigma 17-50 f/2.8 DC EX OS HSM, I read quite a bit about the D7100 behaving the way you described. Apparently it had something to do with the camera and the lens having some stuck communication in regard to the OS (VR) on the Sigma lenses. When I was doing some reading about this, most of the posts were from 2013 and 2014, and apparently Sigma has a fix for the issue (at least on the 17-50) that was made back in 2014. Older lenses could be upgraded, so I would imagine if the lens you purchased was new and not sitting on a shelf for a long time it should have the fix. If you purchased it used or it sat on the shelf for a long time, it might need to have the on-lens firmware upgraded. Sigma can do this if you send it in, or apparently there is some kind of USB interface for the lens, but I know nothing about this - probably something pros or camera shops have.</blockquote>

[QUOTE="DonnieZ, post: 502126, member: 40831"] As another poster alluded to, there could be an issue with the Sigma lens and the D7100. When I was doing research into buying the Sigma 17-50 f/2.8 DC EX OS HSM, I read quite a bit about the D7100 behaving the way you described. Apparently it had something to do with the camera and the lens having some stuck communication in regard to the OS (VR) on the Sigma lenses. When I was doing some reading about this, most of the posts were from 2013 and 2014, and apparently Sigma has a fix for the issue (at least on the 17-50) that was made back in 2014. Older lenses could be upgraded, so I would imagine if the lens you purchased was new and not sitting on a shelf for a long time it should have the fix. If you purchased it used or it sat on the shelf for a long time, it might need to have the on-lens firmware upgraded. Sigma can do this if you send it in, or apparently there is some kind of USB interface for the lens, but I know nothing about this - probably something pros or camera shops have. [/QUOTE]

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