Originally posted by blende8 I have the feeling that for some reason my brain is not working properly today.
I cannot test this atm, since I have the camera not with me.
that's OK
Quote: The camera thinks that it is an f1.2/22 lens, because all contacts are shortened.
yes
Quote: It assumes that the lens is in the A-position.
yes becayse the mod to the camera shorted pin 3 to th elens mount
Quote: It thus assumes that the lens is fully open (F1.2).
yes
Quote: It then will take the f-reading from the camera (which you have set with the back wheel) and will calculate the speed.
yes but it will get it wrong because it is assuming that the open aperture is F1.2 and not what ever the lens is that you have mounted
Quote: This will happen independent of there being an aperture lever or not.
I am not sure of what you mean by aperture lever here, do you mean the activation lever , or the aperture coupling lever on K mount bodies that tells the camera what the aperture is set to.
The activation lever holds the aperture open until the shutter is tripped, The coupling lever is the one deleted when they went to the FA-J mount.
Quote: Or does the camera recognize that there is no aperture lever?
again, the digital camera does not know about the aperture coupling lever because the camera side coupling is missing.
I am not sure you are aware that there were, on K and M lenses 2 aperture levers, one that coupled the aperture ring setting to the metering, and a second that opens and closes the aperture (aperture activation lever).
All K mount lenses have the activation lever, and no DSLR bodies have the coupling lever,
I think part of the confusion also comes from the use of M42 lenses that are stopped down before shooting, these will meter OK in AV mode but P-TTL flash is not easy because the camera does not understand what open aperture is, vs the preset aperture.