[quote=Marc Sabatella;311469]
Originally Posted by stevebrot
Ummm...let me get this straight
- "A" lens
- Aperture LOCKED at A setting
- Green button does nothing in Av or M
Not true. Have you tried it in M mode? It works the same with "A" lenses as with FA or DA. Which is to say, depending on which camera and how you have it configured in the custom menu, the Green button in M mode will either set both aperture and shutter speed to whatever the "program" mode would have selected, or else it will keep the currently selected aperture and adjust shutter speed to give a proper exposure, or else it will keep currently selected shutter speed and adjust aperture to match. I have mine set to keep aperture and adjust shutter speed, because that's what's going to do anyhow with M lenses.
Of course, when using the aperture ring to set aperture, the camera has to stop down momentarily to take a meter reading, so you can *hear* it adjust shutter speed. Whereas with "A" lenses (and FA and DA), the operation is silent.
My Bad... 
I guess I have never used the green button that way. I usually use P/hyper-program mode with my A/DA/FA lenses.
In any case, my suspicion is the OP for this thread has one of two issues:
1) The aperture ring is not locked in the "A" position
-- or --
2) There is an aperture coupling/aperture operation issue (damaged goods)