> On your first set of test images I think f/5 is the best (based on the
> rectangular "flag" hanging out at top left). But it is difficult to
> tell the difference between f/4 and f/6.3. I think some fall-off is
> evident by f/7.1 and it becomes really evident at f/8.
Well, "really evident" is in the eye of the beholder. It also is still
within the realm of improvable with sharpening. However, sharpening to
a limit. The A1 files turn blocky, which is an indication of the
sensel fill-factor.
> Your second test image in that page (the cell phone tower) is harder to
> evaluate. The test area is much larger and composed of straight lines.
> The eye/brain connection has a special ability to make straight lines
> in the brain even where they don't exist. It's a tough target to evaluate.
One must use lines are sharp contrasting edges to evaluate
diffraction. You cannot achieve any form of accurate analysis with
anything else.
> But I do really like your B&W shots in the third test page, especially
> the one with the tree in the center.
Thank you. That remains my favorite digital B&W image.
AG
--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
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