I am enjoying my brand new K-5 plus some old M lenses I bought. Did several tests (and one concert shooting), so limited experience yet with the camera. But there's one thing I just noticed and it can be repeated: highlight in a low light scene differs significantly between 160 and 200 iso. Here's what I mean:
The pictures were taken at 1/25, 3.5-160 and 1/30,3.5-200. If you look at the bright area just above the lamp (the stairs section) you can see that this is much lighter at 160 ISO, but the rest of the image is nearly identical. At higher ISO's the images are nearly identical to the ISO 200 picture (except for increasing noise of course).
I repeated this 'test' for another composition, but with similar results: the 'ISO 160' clearly shows overshoot at a bright area.
Is there anybody who has an idea what could cause this strange behaviour?
Btw: my first posting, but this is truly a great forum, I already found lots of very very usefull information here. I love forums, especially the Pentax forum!