D850 Focus problem

Started 7 months ago | Discussions thread
mais51
mais51 Veteran Member • Posts: 3,431
Re: D850 Focus problem

Al Giordano wrote:

I have this problem with my Nikon 105 F2.8 Micro. I bought it used and sometimes it refuses to focus; until I twist the mount. I've cleaned the contacts and even sent it in for cleaning, calibration, and testing and there is still something going on with the mount. Once I twist the mount tighter, it works!

May be that why the lens was sold to you - used items sometimes hide unresolved problems that unscrupulous sellers offload to the the unsuspected buyers.

As for OP problem it was clearly an electrical contact issue - the fact that the lens already mounted doesn't mean that contacts are secure - it could be loosed due to handling or minor discrepancies - especially with third party lenses.

 mais51's gear list:mais51's gear list
Nikon D800 Nikon D850 Nikon AF-S Nikkor 50mm F1.4G Nikon AF-S Nikkor 24-120mm F4G ED VR Nikon 85mm F1.8G +7 more
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