Its so easy to be a victim of this – and to then find everything lacking.
At normal viewing sizes (or web viewing) everything looks great,
but then you zoom to 100% and SHOCK! you notice that focus isn’t exactly spot on.
Damn, didn’t you know that lens was a dud? – send it back!
I jest not, I fall victim to this myself.
I pay for a lens (normally not cheap) and I want it to work perfectly.I don’t want to mess around with AF fine tune and all that malarkey.
But, in all seriousness, unless the problem is actually noticeable un-zoomed, much as it peeves me, I am less than likely to do anything about it.
Now when it comes to camera bodies (yes Nikon, I am specifically talking about you) that’s a while ‘nother story.
(P.S Which may get more than a passing mention depending when mine is finally returned to me)