At 9:31 AM -0500 12/4/13, Mark Roberts wrote:
CollinB wrote:
The DA* 16-50 can be superb, but many of them have element alignment
problems. You have to test and insist on a good copy or correct repair.
Paul
What does one look for in the image? Coma? Corner softness?
Just take a photo of a flat surface (the classic brick wall test, for
example) perpendicular to the camera/lens. Focus in the center with
the lens wide open. Look at the resulting image and check that the
left and right edges are *equally* sharp; do the same for the top vs.
bottom.
I thought that the decentered lenses were just in the early production
runs of this lens (though I could be mistaken). I have a good one and
it's a totally superb lens.
Good to know. I will be testing my copy today!
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