Originally posted by UnknownVT I have to catch or even predict fleeting moments with musicians and a capture lag/delay of up to 1/4 sec or more is not acceptable -
Is a camera with long shutter lag/delay acceptable?
Well, the answer to pretty much every question like this is, "It depends."
But to be less evasive, I'd say, no, a 1/4th sec shutter speed would be too slow, for shooting human beings in action. That's why I almost never go below 1/30th sec, when using flash. Shooting an event like a wedding, in a church, without flash, if my subject is standing frozen still (as is often the case) I'll risk 1/20th sec. But at that point, I'm worried about camera shake (even with shake reduction enabled) so I don't dare go slower, at least not without a tripod. Do remember that back in the old days—100 years ago and before that—shutter times in the several seconds were common. All those famous portraits required the subjects to FREEZE AND HOLD for several seconds. I rather like some of the group portraits where the grown ups are all sharp but the kid is a bit of a blur, because he squirmed.
Anyway, back to flash. No, I'd not go below 1/30th sec. And perhaps 1/45th sec—Pentax's preference, apparently—would be even safer. However, you should remember that shooting with flash is really quite a different thing from shooting without flash. The flash now freezes the action as much or more than the shutter speed. So even if the shutter speed seems too slow for use in normal, good ambient light, it MIGHT very well work with flash.
Consider the attached shot. Settings: f/5.6, 1/20th sec. My cat Mao was walking through the living room, not running, but walking fast enough that without the flash the shot would have been blurred at 1/20th sec. In fact, if you were able to look at this really closely, you could see some very slight traces of movement. Nevertheless, the flash freezes the moving cat pretty effectively. (NOTE: This is a very tight crop showing less than 10% of the original photo.)
Will