5N w. Manual lens - ISO is not auto?
Auto ISO works in both A (aperture priority) or S (shutter priority) modes. I low light, I use shutter priority which works essentially as a manual mode with automatic ISO. You set the aperture on the lens, the shutter speed with the rear dial and the camera selects the appropriate sensitivity.
I am using a 50mm Canon FD lens with the 5n. Manual focus.
I set the Iso selection to automatic. The shutter is auto also. Shutter works fine but the ISO is fixed at 100 unless I manually change it.
How do I set the ISO so that the auto iso really is auto and varies? I am using shutter, aperture and program priority without any auto iso kicking in.