I recently bought a used 35L, and I am convinced it's out of calibration.
I've seen a bunch of 100% crops from this lens online and I'm 99% sure my copy is just soft. It doesn't begin to get sharp until about f/2.8. F/1.4 is unusable. It's actually quite similar to the images in this FM thread:http://www.fredmiranda.com/forum/topic/922937/0
Ultimate sharpness is not critical to me. If it had been, I likely would have purchased a different lens. I've used different copies of the 35L in the past and they neither behaved like this.
I've done a couple of AFMA and it's not any better. From my understanding AFMA will correct front focus and back focus, but FF/BF is not my issue. Even with manual focus, I cannot achieve anywhere near the level of sharpness I should be able to. I was expecting a little soft at f/1.4, and then approximately as sharp at f/2 as my old 35mm f/2 non-IS. I did a "manual" AFMA and got a setting of -8. I then tried the DotTune method and got a similar result, landing at -10 (-17, +3). FWIW, my 6 other lenses are all within +/- 2 of zero, so I have a fair amount of confidence that my camera is at or near zero. This 35L appears to be the outlier, my other lenses perform similarly on other bodies as well.
So where do I go from here? It's a used lens, presumably out of warranty. If I send to Canon, what exactly am I asking for, a "calibration?"
On a side note, I do have enough points for CPS Gold, would that be a better way to go about fixing this? Would this be covered under their standard 11-point inspection for lenses, or would this type of repair be separate?
Can probably post some pictures later tonight but looking for advice in the mean time.