Af tuning

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Pini New Member • Posts: 13
Af tuning

Hi

I use Nikon d7500 and Sigma 17-50

When i try af tuning by camera

At 17 mm i get values 0-1

But at 50 mm the camera cannot af tuninig.

Ehen i test my len on paper with numbers:

At 17 mm i get fron focus

At 50 mm i get back focus

How can i celebrate my len.

Nikon D7500
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