Using AF Tuning on a 70-200: when to send in for repair?

Started Oct 13, 2012 | Discussions thread
OP ne beginner Senior Member • Posts: 2,147
Sending it in ...

I've re-tested, looked back at some of the tests I did earlier pre-D800 repair, as well as images taken with this lens. My conclusion is that this problem existed before, but I didn't notice it.  I found an image taken pre-D800 repair, at 70mm, AF tune @ +20, using LensAlign , and it clearly shows the +20 did correct the front focus.  I probably didn't look closely enough, since I hardly shoot below 135 on this lens.

I mostly out near 200mm, so I probably never noticed this before. I don't have  alot of images below 100mm to look at, and almost all that I have are above f5.6.  I found a few at f2.8, and none processed ... I think I just passed them off as poor shots OOF.

There is definitely a 16 - 17 click variation between 70 and 200mm today, and that needs to be adjusted.

At 200mm, a +20 pre-D800 repair, and 0 now,  makes sense.  My 24-70 also went from +12 to between 0 and +2.

 ne beginner's gear list:ne beginner's gear list
Nikon D750 Tamron SP 70-300mm F/4-5.6 Di VC USD Nikon AF-S Nikkor 85mm f/1.4G Nikon AF-S Nikkor 24-120mm f/4G ED VR Nikon AF-S Nikkor 50mm f/1.8G +1 more
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