Originally posted by PentaxPoke No others want to play? I was sure I would get comments from people who can see differences in the "rendering," "color," and "contrast," of different lenses as figures of merit.
I started to write something up before you posted this, but backed up. Here's what I was going to say, and I swear, I am saying this *before* looking at the answers below:
While #4 is the least sharp, it's hard to be sure if that is really the lens or if it is just focus error or shake of some sort. So while I'm not saying it isn't the 18-250, I'm going to put that aside and concentrate on the distortion visible in the wall.
#1 and #3 distort one way (based on the curvature of the top line), #2 and #4 the other. #2 and #3 are better than #1 and #4.
Not know much about the physics of things, I'd say that one end of a zoom would be likely to distort one way the other end the other way. So if the 17-50 is #1 or #3, the 50-135 is #2 or #4, and vice versa. I'm also taking it on faith that the 50-135 and FA50 are the best. So either #2 is FA50 and #3 is 50-135, or the other way around. #1 is the only one I'd call "bad" with respect to distortion, so it's either the 18-250 or the 17-50 which I know little about. I'll bow to the fact that #4 *is* noticeable less sharp and call it the 18-250.
Doing the math, the works out to:
1) 17-50
2) 50-135
3) 50
4) 18-250
Looking at the answers, obviously, I'm quite wrong :-). I wasn't really believing for a minute that apparent lack in sharpness in #4 was significant. Truth be told, I really *wanted* to call #1 the 18-250 because as I said, it had the worst distortion. It appears I might have guessed right about the direction of the distortion between the 17-50 and 50-135. But I think I still would have assumed the 50-135 was #2 or #3, and that the other was the 50. So at best, if not for the sharpness issue, the best I probably would have done would be the get #1 & #2 correct but reverse #3 and #4.
Oh, another thing I noticed but didn't mention: the view in #4 seems slightly narrower than the others. That would have made me assume it was either the 50 or the 50-135, which of course are the ones in which you'd have had no choice. Again, the lack of sharpness threw me off that scent.