07-29-2010, 06:11 PM
Hmm ok, bokeh test confirms aperture is locking right at capture time too. The exposure shift seems to be mostly occuring from wide open (at all focal lengths) to 2/3,1 stop down.After that, exposure is stable. I thought at first that it was only the perception of less vignetting but there's still a slight exposure boost IMHO. But not so much to worry about.