Originally posted by falconeye This is not true. Superzooms have weak corners, but not THIS weak.
The DA 18-135 has a very good center resolution, but I've never seen the border/corner drop below 1000 LW/PH (at f/5.6!). And this for a K-5 test with higher numbers overall than for K10D.
This is unprecedented. Otherwise, Klaus wouldn't have had to ask Pentax if the result can be true.
This is less than 1 MPixels in the corners. IMHO, it is not acceptable for any dSLR lens.
E.g., look at the borders of
http://photozone.smugmug.com/photos/1253576403_fCVfGSD-O.jpg . Would you print this?
Well that image looks really bad! I have never seens such smeared corners from my shots with the lens.... i suspect theres something
wrong there, either with the lens or something else.
Below is a picture taken at 135mm f/8. The crops certainly confirms the low resolution in the corners. But imo not as bad as the one above!!!
top left
top right
an ordinary normal use snapshot.
an other picture that im very happy of from this lens.
I admit i am kinda biased to my use of the lens. I only use it for day to day snaps on family and friends, when i only want to take the camera with me, when i dont want to have to juggle the primes around.
I always said since i got the lens that i would not recomend it to anyone regarding the price. There are cheaper and better options regarding image quality.
So still, this is the basic topic that people need to ask themselves. Is the other qualities of this lens appealing enough to buy it?
For me, hell yeah! I've got this lens as my only zoom alongside my Ltd trio, with a small tripod and a very small shoulder bag. Its what i wanted from the start. A very small and capable package.
Bottom line is imho. The 18-135 has great value to some and some others not.