16-35 sharpness

Started Sep 7, 2011 | Discussions thread
Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 13,599
Re: 45 degree test targets can cause mis focus

savenkov wrote:

I've checked that the lens is focused correctly using 45-degree scale.

AF detection lines are always longer than the viewfinder AF marks, and can lock on detail much smaller than the AF mark.

Coming from infinity if the AF system detects enough detail to focus before it gets to where you intended to focus it can do just that - and focus further away than the center of the viewfinder mark
Coming from minimum focus AF can focus closer than where intended
Sorry - 45 degree test targets can result in garbage results.

There is a 99.9% chance if you re test with a good AF target parallel to the sensor your perceived focus issues will be instantly cured

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Leonard Shepherd

Photography could be easier - if cameras and lenses came with an increase in skill button.

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