What bothers him is that a more useful mirror-up mode (for shooting) is a one-press mode: with the D300 you have to press the shutter button twice, once to lock the mirror up, once to shoot. Since the reason you shoot with mirror up is to get rid of camera vibrations from mirror slap, this is fairly pointless if you INTRODUCE vibrations from shutter release pressing, hence you need a tripod and a remote to use the function. With a one-press mode you press the shutter, the mirror goes up, and a couple seconds later the shutter releases, the exposure is made, and the mirror drops back down. It's kind of like combining a self-timer and a mirror-up in the same feature. Works great if you see a long exposure shot you want on the spur of the moment, and set your camera on a fence railing or something, whatever.
Personally, I don't see the need of it. If I cam concerned enough about sharpness to NEED mirror lockup, then I'm shooting from a tripod; and if I'm shooting from a tripod I'm using a remote, so...
R.
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