Originally posted by Mike Cash Thanks, Jonas. I understand very well now what you meant. I have largely skipped threads specific to the K10 because I don't have one.
Having seen that graph, I'm glad I don't.
Just to be clear, the exposure errors with old (ie, pre-A) lenses and the K10D have nothing to do with manual-, as opposed to auto-focus.
They arise because it is not possible to set the aperture of pre-A lenses using the body. So the aperture ring on the lens must be used to set the aperture, and then the green button or optical preview lever to get the camera to stop the lens down and meter with the lens stopped down.
It is the metering errors with the K10D (and not, AIUI, with the K100D) in stop-down mode that give rise to the exposure problems.
Use A-series lenses (set to A) or later, MF or AF, and no such errors arise.
It's been suggested in various quarters that with a focusing screen from a DS, the errors go away; if anyone has a K10D with such a screen, and either M/K series lenses, or A lenses that they can switch to non-A mode, it would be interesting to see the line included on Jonas B's graph.