Originally posted by creampuff +1 on what Marc said.
jct us101, when you proclaim that lens based shake reduction has a little less chance of having problems, please spare a thought for the many Nikon 18-200mm VR owners who have experienced an abnormally high rate of failure with this lens. Unfortunately since you don't even appear to have on hand any Pentax camera with SR, your claims of the purported weaknesses of in-body stabilization is questionable to say the least.
I've owned two cameras with SR in them, actually. I've also owned quite a few lenses with IS built into them. So please don't try to discredit me, because I know what I'm talking about.
When the mechanism is built into your camera, then if something goes wrong with it, you have to buy a new camera or not have SR (NOT THAT I SAID THIS HAS EVER HAPPENED, KEY WORD HERE IS IF), but if it's built into a lens then you just replace the lens. I suppose my first post didn't make as much sense how I made it, but maybe if I use a human analogy it might help (or just make it worse).
If you have a bad leg, then it has to be amptuated, and you just have to live with that leg, but if you have a bad kidney, it can be taken out, and you'll still have another one to keep you alive and fine, without much visible difference. I guess it could be compared to lens based SR versus camera based SR in that way, although I'm just not sure what I'm even talking about anymore.
You know what, never mind.