Originally posted by newarts You say ".. the k-x does just this." What is "this"? Do you mean with an M lens the K-x moves the aperture lever to set exposure when the green button is pushed in M mode? If so, does it also move the aperture lever to set exposure in other modes with an M lens in M mode?
Dave
M-mode & M-lens : On green button press it releases the aperture lever (the lens goes to the position set on the ring), meters and returns the lever to fully open. For some reason mirror goes up too while aperture is closed. Stop-down with exposure as well.
Av-mode & M-lens: continuous metering with aperture open, exposure results are the same regardless of aperture ring position although I can see aperture closing to the position set on the ring trough the lens when I press shutter fully. Green button has no effect (with its default setting at least).
With an M-lens other mode dial positions than M result in Av-mode being used. (Except movie, which somewhat surprisingly works with full aperture control with the ring :-)