[stunsworth]

Rob, I used an adaptor from Cameraquest - expensive but well made. I've also tried one of the cheap Chinese adaptors with AF. The AF chip on the adaptor was just glued on and fell off after a few days.

Regarding exposure, the lens closes down as you turn the aperture from say f2 to f8 - there's no auto diaphragm - so the image gets dimmer and this is reflected in the metering. As well as metering manually you can also meter using aperture priority. What I used to do was focus with the lens wide open, then stop down the lens and press the shutter. After a short while this becomes second nature and you quickly learn how far you want to turn the aperture ring.