Originally Posted by NeverSatisfied 
Lowell, your reference to using the green button in changing light: is that -along with- using EV comp? I use M mode mostly, and use the green button a lot. So it sounds like you'd quickly get the "proper" exposure with the green button, but meanwhile the EV comp setting you'd already chosen remains constant, the result would be the desired amount of over- or under-exposure. Correct?
that's right. I check all my lenses manual or automatic, for exposure when I get them, helps "learn" their performance. once you know they have a slight error, dialing in the EV is a good solution, and on the *istD it works in manual also so you don't even think about it. push the green button and you have it perfect.
Glad you said that about using TCs. I remember using the 1.4 TC on my 50-135, and having to use EV comp to get the right exposure.
this is an important point on the K10/K20.
I can almost see EV comp being more useful in M mode, than in Av or Tv- after all, as far as the latter two modes are concerned (and as I just learned last night), all the camera is going to do with your EV setting is adjust the opposite value accordingly. At least in M you would still have complete control over your shutter and aperture settings. Or am I still missing something?
Interesting point about using older manual lenses, good to know.
nope you pretty well have it here. I just wish the K10D had it in manual, because it would make exposure for my 300F4 and 1.7x AF TC much better
The real problem is the fast l apature lenses on the K10. faster than F4 these lenses under expose, slower than F5.6 they over expose.