Jostein wrote:
Just a hunch, I don't have any hard knowledge on this....
I think one issue with wide-angles is that the all optical elements have to be properly centered. I know one German photo journal used to test this when doing MTF tests. Maybe a slight misalignment of an element could cause what you observe?
Jostein
Okay, but... how do you account for Alan's comment:
* * *
"Now is the weird part. I did some careful test on a 2D subject (aligned with bubble
level and shooting straight down at very close distance, about 0.6m) but there is no
trace of blurry edge/corner at all. Both sides of the picture look equally sharp, or
at least I cannot tell the difference."
http://www3.telus.net/wlachan/f11.jpg (2.8MB)
* * *
If that's true, it doesn't happen all the time.
Just curious... keith whaley
