AF- fine tuning on Z7

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Laci55
Laci55 Senior Member • Posts: 2,342
AF- fine tuning on Z7

Could anybody explain why any fine tuning is possible or necessary?

I have an experiment and compared the sharpness between my 70-200/2,8 E FL ED and the Sigma Art 135/1,8 lenses. The sigma was obviously sharper and I thought that it should be in this way because I tried to compare a prime lens with a zoom... After a while I analyzed the pictures and thought that my zoom was "back focusing"... I made some AF fine tune corrections and at the value of -4 the zoom became as sharp as the Sigma without any doubt... After that tried the zoom at different distances and the lens is tack sharp now...

Could anyone explain what is going on here???

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 Laci55's gear list:Laci55's gear list
Canon EOS-1D Mark IV Canon EOS-1D X Nikon D5 Canon EOS-1D X Mark II Sony a9 +19 more
Nikon Z7
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