As Mark Roberts pointed out, the A pin disconnects when OFF the a position and short (just like a K/M mount) when in "A".
So, how does the body know an A lens is present as compared to a K/M lens? It must be the presence of a coded value in the other pin positions. Since the A mount is passive electrically, that's all that's left. Is it a correct conclusion that placing divots in a K/M mount to correctly identify a lens would make it act "A"? Was it was also stated by someone that this might not work because of the linearity of the aperture control arm. If this is so, does the camera stop down by position or light reading? Has this been verified? -- -- Collin Brendemuehl KC8TKA "Ron Santo deserves enshrinement in Cooperstown." -- Me --
