Originally posted by jfdavis58 And so his eyes will deceive him?
Not his eyes.
On another forum I read someone was posting examples taken with a lens that was supposedly 'soft' and therefore needed to be returned for a refund.
The test shots were taken in virtual darkness, with an exposure of 1/15s, of a moving target. They were then reduced to fit a web page.
The pictures posted were indeed slightly soft, but were they evidence of anything at all?
Of course not. The lens might have been defective, or it might not. The softness might have been caused by focus error, lack of depth of field, subject movement, camera shake, maybe even the reduction process - but from the 'test' it was impossible to tell.
My point stands. People are notoriously bad at eliminating from their 'tests' other things that could cause the issue under investigation, and are sadly prone to jumping to all sorts of premature conclusions.