Quote Originally Posted by CliveC View Post
It's hard to believe a variance of 0.05V will cause the meter to be out consistently like that. It seems to me far more likely that the meter needle was knocked out of alignment at some point.

With the 35RD, even without the battery, the needle will move in manual mode to show the selected aperture. It's still off by one stop. I've eliminated the battery as the source of the problem.
It's .15 volts, better than 10%. It will make a difference.

If you do not wish to buy an adapter, you can use a #675 hearing-aid cell and an O-ring (as a bushing to hold the cell central). If you block off three of the four airholes in the cell, the service life will be increased drastically.