What I mean is the sharp area going a bit from the top-left to the lower-right, instead of straight from left to right.
I assumed this was what cracotzia meant by 'decentering'. If not, just ignore all I said before

¿?
I think that decentering is just a variation of focus across the frame, no matter the direction. The performance of the lens should be symmetrical, if it is not there should be a problem of alignment of the optical elements. Please correct me if I´m wrong. In my copy, it´s not always so evident, but i´d like to know...I´m not sure if that issue can be corrected by service.
Anyway, the possibilities of this lens are amazing. I like it!
regards.
http://www.flickr.com/photos/pifatore/![]()



I've been too lazy to get to that, but I agree.







