I've been using the Canon FD 85mm 1.2L on a New Canon F1 for film and also on my RP for digital. On the RP, I was able to see the effects of the aperture using exposure mode enabled, but now when turning the aperture on the lens when using either camera I don't see any changes in the size of the aperture or exposure. When using the DOF indicator on the F1 it does not stop down or move the blades. I know that to aid in focusing the F1 will keep the lens open and then stop down to selected aperture when pressing the shutter, but is there a way to look through the lens and observe the aperture changing when clicking different stops? Thanks for any input.