Originally posted by imtheguy I KNOW you don't mean f/1.4-2ish with the 16-45mm lens.
Heh, no, you're right. I didn't mean that!
I have this focusing issue with my FA 50mm f/1.4, and for a while I thought it might be specific to that one lens. But as asdf pointed out (and I had to ask around here also, sometime last year), this topic has come up a bunch of times in the past, so I eventually figured out it's probably only visible to me at large apertures, and masked by DOF otherwise. That's the only autofocus fast lens I have.
The 16-45mm mentioned in this thread, being f/4, caused me to wonder whether the lens needed adjustment *beyond* the warm-lighting issue. And if that's the case, in my opinion it's best to do that adjustment in natural light.
My FA 50mm autofocuses perfectly outdoors and needs no compensation, so the frontfocusing under artificial light is just an unfortunate fact of life. On the other hand, I have a Sigma 24-60mm f/2.8 that front-focuses in all light conditions, so that one gets compensation.
Boy am I glad my K20D has that function!