I think this is a rookie question and I guess I got the answer but to confirm.
I have old manual focus lense in Mamiya 645 format for example 45mm F/2.8 C, just put on Mamiya AFDIII body. I found that I had to stop down the aperture to get correct metering. This is all right because I planned to use M mode anyway. However...
a) If I stop down to e.g. F11, it is very dark to focus
b) The electronic focus indicator stops working under F11
I guess the M/A switch helps here: I can switch to A to see the brighter viewfinder, focus; then switch to M to stop down to take a photo (If I use Av mode, now I can get the correct exposure with suggested shuttle release number).
So is that the correct way? The shuttle release will not trip the aperture in A mode? As I can see this manual lens doesn't have aperture level like Nikon lens, so I have to do A switch to focus and M switch to take a photo (especial with smaller aperture)...
Also, the F number can not pass to the body so it is '--' all the time.
Any comment is appreciated. Thanks!