Quote Originally Posted by Bill Burk View Post
Unscrew the lens 1 turn (to uncouple the aperture coupling) and adjust the stopdown metering to be accurate. I'm pretty sure this stopdown metering is only supposed to be accurate with old lenses.
Sorry, I should have clarified. I was testing the open-aperture metering with a 28mm SMC tak with the proper lugs to engage the aperture tabs on the mount. I was testing the stop down metering with an older 50mm super takumar which doesn't have those lugs (i.e. isn't designed for open aperture metering).