Anybody else noticing some weird behavior with edge sharpness at all? I am thinking it may be a field curvature thing, but not exactly sure.
I tested out my 11-24 very carefully when I got it and the corner and edge sharpness across the frame always looked comparable with no real difference. After using it on a trip quite heavily, I seem to think that the right edge of the frame is usually a little softer near the edge. The weird thing is, sometimes its razor sharp and other times not... I assume it depends on where the focus point is and all that, but the left side doesn't seem to follow the same trends. It always seems a bit more consistent and holds sharpness from near/far where the right side may be better at near than far in terms of DOF. I have seen some field curvature maps and have seen most lenses are not exactly symmetrical, so I suppose it makes sense if it is a little imbalanced.
It seems to be that the edges get sharpest when the focus point is closest to infinity on a landscape shot. I know many lenses (especially UWA's) usually have some type of field curvature, I am not concerned about that... But just seeing if anyone else has noticed some weird results with edge sharpness?
I know with UWA's (especially at 11-12mm or so) the lens mount and sensor position can play a huge part... I haven't been able to try it out on another camera to see though if that helps.
I have had a few decentered UWA lenses before and this isn't like those... With those, you could never really get the sharpness. With the 11-24, I get razor sharp images at the edge of the frame (both sides) wide open, but depending on the shot sometimes the right seems to lag behind the left. I just have not figured out the trend yet. I need to spend some time and try to see when it occurs I suppose!
You may have a slightly decentered element. Which happens, there is copy variation. The required precision to avoid copy variation would cost about $20,000 per unit.