>>4227927there are two different locations of the aperture feeler, on different F mount cameras, with vastly different abiliies
one - is located at about 2:00, and feels the aperture of an AI/AI-S lens by rotating around the mount with it as the aperture ring is adusted
the other - found on cheaper bodies - is located about 8:00 and its only job is to make the camera blink "fEE" and if an AF-D lens is set to any aperture other than the minimum. it does not rotate and can't detect the set aperture, it is just an on/off switch
look at a pic of an FTZ and see where its prong is
