Check the aperture blades in the 1.4 to be sure they are moving as freely as the 1.7. I had a 35/3.5 doing the same thing, the blades were just slightly sluggish. Cleaning them solved the problem. The blades are apparently given more time to respond when the green button is pushed then they are during the actual exposure.
Don > -----Original Message----- > From: Peter Smekal [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 29, 2005 7:44 AM > To: [email protected] > Subject: *istD overexposure with M50/1.4, but not M50/1.7 > > > This time I only tested two lenses. *istD M mode + the green button. > Aperture 8 in both cases. Same scene. M50/1.7 works just fine, M50/1.4 > gives totally washed out overexposures. Any clue? > Peter > >
