Back focus Front focus D7100 observations

Started 5 months ago | Discussions thread
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davemar53
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Back focus Front focus D7100 observations
5 months ago

Have just recieved my D7100,Carried out focusing test  using A Nikon 180m 2.8 lens at F8  on both my existing D90 and the new 7100,

carried out numerous checks on both to make sure the results were not a one off.

The D90 was sharp as a tack, the 7100 was way off,just totally unacceptable  ,used Jefreys lens checking scale,it was front focussing and needed +17 on the fine tune menu to get it sharp,all my other lenses  also required  front focus adjustment.

Question,on the 7100 what does the fine adjustment do in regards the sensor i cant believe there is a physical movement of the sensor,so that leaves some form of adjustment re the algorythum or electronic signal,do you consider a +17 adjustment to be reasonable when the max is +20.

After all the earlier probs with focus on this model i would have thought problems were sorted

My serial number begins with a 7---- .

Any tips on checking focus would be appreciated.

Just to rub salt in the wound the viewfinder diopter correction is not as sharp as the D90.

Nikon D7100 Nikon D90
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