Originally posted by B Grace I do have to press the shutter button half-way to wake up the meter in my K200D before the green button will work.
Interesting. I had assumed so too, because I knew it was true on my DS, but I tried it out just before posting yesterday and couldn't get the green button to not work. Of course, if the whole camera has gone to sleep - not just the meter - then you need to wake it up.
Quote: Finally, I'm not convinced the stop-down metering process gives an accurate meter reading at smaller apertures
This is definitely a widely-reported problem on the K10D, apparently related to the focus screen and other issues that don't seem to affect the Kx00 or *ist series. I did a test series with my K200D an M135/3.5, ponting at a scene and running through the green button sequence and taking a shot at each aperture ring setting. The results were as consistent as one could possibly hope for - all exposures came out within about a quarter stop of each other.
It's possible, of course, that individual lenses might have aperture rings that are not entirely accurate in smaller apertures. And it's also possible that if you repeated my experimented in something other bright sunlight, the total amount of light entering the camera would be below the threshold for what the meter needs.
Quote: It's possible the custom menu selection for allowing the use of lens aperture rings changes the program for the meter but I'm not sure.
Wow, that's a possibility I've never heard raised before! I kind of doubt it - the camera knows when the aperture ring is being used anyhow, so no need to change the metering behavior for all lenses just because you've enabled this setting. But of course, actually using the aperture ring *does* switch you to center-weighted metering if you had been using multi-segment.