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Clearly unsharp 85mm 1.8D

vancwa

Vancouver, WA, US
254 posts

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"Update: added some test images"

vancwa Silver Member Nikonian since 12th Sep 2007
Sat 05-Jan-13 11:21 PM | edited Sat 05-Jan-13 11:22 PM by vancwa

My friend printed a resolution chart and mounted it to a flat surface. (This was admittedly not the "real" ISO standard resolution chart, but good enough for subjective comparisons.) The camera is a D90 and was on a tripod and carefully placed at 90 degree angle to the chart. I really don't know the distance but he probably came close to filling the frame.

He shot several sequences - 5 at f/1.8 using AF, 5 at f/1.8 using MF, 5 at f/4 using AF, 5 at f/8 using AF. All shots within a group of 5 look identical so no point of posting more than 1 here. The AF vs MF look the same at 1.8. The f/8s were, of course, very sharp.

I don't believe there is any way to adjust a D90 for for front or rear focus. What do you guys think?

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Click on image to view larger version



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Attachment#1 (jpg file)
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A general, generic topic Clearly unsharp 85mm 1.8D [View all] , vancwa Silver Member , Sun 23-Dec-12 07:41 PM
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