Originally Posted by jsrockit
Can you explain this? On the M9, this lens shifted more than any other lens I've used...and by large amounts.
As far as I understand, if optimized for 2.8, the focus will shift about 2-3 cm forward at MFD wide open, which can be easily compensated for, for example by focusing on the rear eye instead of at the front eye in a portrait. Stopped down a bit, the shift backwards should be less important and DOF should compensate for it. When you say large amounts, I would suppose there was an unfortunate combination of focus shift and lens miscalibration which is not so uncommon.