I paired up my D850 with an older 28mm f/1.4D AF lens to test its’ sharpness wide open. I shot a few images that had writing or numbers and found them illegible when loaded in a computer. I consulted a guide book on fine-tuning AF lenses and found the procedure pretty easy. An object, such as an angle bracket, is placed on lined or graph paper. With camera firmly on a tripod I used the 850’s AF to get the bracket in focus. When I put the image in the computer it was obvious the focus point was 5 lines behind the face of the bracket (middle photo). This meant this lens was “back focusing” on the D850…
hmmmmmmm
In the 850’s menu under “setup” there is a fine-tune function for lenses. You can add or subtract values to make focus adjustments for your camera & lens combo. I just guessed at -5 since it was 5 lines back focused. I re-shot the bracket on the paper and looked at the image in the computer. It worked! Lucky guess.. Bottom photo shows results of adjustment.
hmmmmmmmIn the 850’s menu under “setup” there is a fine-tune function for lenses. You can add or subtract values to make focus adjustments for your camera & lens combo. I just guessed at -5 since it was 5 lines back focused. I re-shot the bracket on the paper and looked at the image in the computer. It worked! Lucky guess.. Bottom photo shows results of adjustment.
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