D7100 sometimes can't focus

Started 5 months ago | Questions thread
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Bbawt1
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D7100 sometimes can't focus
5 months ago

Hi - hoping someone can help me with a problem, one I'm sure is operator error as opposed to the camera! I'm trying to master the various focus modes and am using back button focusing which I love. Every once in awhile though when I press the back focus button, my lens seems to try to focus from one extreme to the other and just keeps going like that - spinning one direction then the other, and finally stops completely out of focus.  Then next time it might work just fine.  Seems to be both my 18-105 kit lens from my old D90 and my 70-300 but never has done it on my 50 1.8.  Can't seem to replicate it but wondering if anyone knows if this might occur more in one mode or another - I tend to shoot in aperture priority and use all 3 modes (A,S,C) and 9 point focusing - often focus and recompose style.  Any ideas why sometimes the camera/lens just can't seem to focus on anything and keeps spinning back and forth?

 Bbawt1's gear list:Bbawt1's gear list
Nikon D90 Nikon D7100 Nikon AF-S DX Nikkor 18-105mm f/3.5-5.6G ED VR Nikon AF Nikkor 50mm f/1.8D Nikon AF-S Nikkor 70-300mm f/4.5-5.6G VR +1 more
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Nikon D7100 Nikon D90
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