In-camera IS at long focal lengths

[Ron Kruger]

Well, I'm not real sure about it. I'm just beginning to experiment with this, but so far, I've noticed more sharpness with the IS off. What I have observed is just with a 200mm, and it's a f/2.8, so I can often get more than 1/200th shutter speed. When hand-held, I'm going to turn it on under that and turn it off over that. As Clicker pointed out, the longer the focal length the more pronounced the shake. If I was shooting a 400mm, I wouldn't turn it off unless I had 1/500 or higher, and with a 600mm, I don't image I'd ever turn it off.
You're excellent at these kinds of experiments under controlled conditions, Loupey, and I for one would be very interested in your results.

[Sushigaijin]

I find that mirror lock-up is only useful in the 1/2 to 1/8 range. Any slower shutter, and the mirror slap isn't long enough to matter. Any shorter, and the exposure is too fast to be effected. Composing with the LCD is ungainly, for now. I'd imagine the newest crop of DSLRs (olympus, at least) with p&s style live-view make it a lot easier.