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Message: <blockquote data-quote="jr19" data-source="post: 426830" data-attributes="member: 11908">I will tell you that my Sigma 70-200mm f/2.8 is not fully compatible with the D750.  However, they told me I could just send it in to get the firmware upgraded and it would work.  I haven't gotten around to it because it still works, but there is a catch.  I use back button AF and I have to press the button once to "wake it up" and then press it again for it to focus.  It seems to focus fine in all AF modes, but it gets a little bit annoying when taking action shots.  If I haven't "primed" it, I might miss a shot.So I wouldn't be surprised if the 24-105mm has the same issue, but maybe someone who actually has it can chime in.</blockquote>