Still not happy with the D850 AF

Started 3 months ago | Discussions thread
ericbowles
ericbowles Contributing Member • Posts: 984
Re: Still not happy with the D850 AF
1

patricksmith32 wrote:

Yeah I had a D850 for awhile too, but I prefer my D5 bodies so sold it, not for what I do which is photojournalism! However my D850 worked flawlessly and no AF issues at all. I’d say it was about 85-90% as good as my D5’s AF performance but definitely not the same as claimed by Nikon. However I too am suspicious it’s the D850 itself, I’d bet it’s the heavy super tele lenses. If you mishandle those at all over the years you use them they can have a bent mount or cause a bent mount as well. So typically when you have AF issues like described it’s a bent mount. If it was every lens only on that one D850 it would be the camera. However since it’s only two or three lenses on the D850 and those are heavy lenses it’s very possible it’s a bent mount or mounts I should say. I can’t think of any other explanation for this weird behavior. Unless these are just old AF-I lenses there could be other issues, but if they are newer AF-S VR 200mm and 400mm VR lenses it’s probably the mounts. I would personally send in the lenses that are causing the issue and have the mounts replaced, or send them in along with the D850 and that might help too. Either way I believe they are fixable or repairable I should say. Replace the mounts, maybe other parts as well and calibrate them afterwards, all of which Nikon will do.

Patrick - I think you are right about the mount.

My D850 had some serious focus problems with the 70-200.  Nikon replaced the mount on the D850 and adjusted focus on the 70-200.  I had not tested longer lenses for the issue, but the camera had 100,000 clicks and was used with long lenses as well as very active photography.

The mount is designed to be easily replaced.  The mount can show a surprising amount of wear under high magnification.  The mount is intended to give a little in an impact rather than rip the mount out of the camera which would be catastrophic.

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Eric Bowles
BowlesImages.com

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