Phil Askey, DPReview (http://www.dpreview.com/articles/nikond100/ ) has been playing with a pre-production D100 and has written up some of his impressions as well as detailed descriptions and images concerning the cameras operation and features. Check it out!
I found the mirror pre-release and (AC only) mirror lockup to be interesting features.
Phil has shown the camera as having color matrix metering and I don't see any evidence of this in Nikon's specs. If this is true, this would be the first mid-line body to have RGB metering. To my knowledge, only the F5 and D1 series have RGB metering.
Phil has acknowledged that the spec showing color matrix metering was a cut-and-paste error. The D100 doesn't have RGB matrix.
Unfortunately the mirror lock up isn't what you might be expecting: this is the very misleading name Nikon give to the function that raises the mirror and opens the shutter so you can clean the CCD - hence the AC adapter only qualification: they don't want to chance the battery running out and the shutter closing / mirror coming down while you're cleaning the camera.
What a shame! I was hoping Nikon would have fixed one of the major complains I'm having about the F100. No mirror lock-up.
What about the cable release feature? When using 'bulb' on my F100 the batteries getting drained pretty fast. Does 'cable release socket' means it would not use battery power for keeping the shutter open in bulb?
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Ah! I remember reading about this for cleaning the D1 CCD - it is misleading. I'm not sure I share Nikon's faith in uninterrupted AC power supply to keep the mirror up while you're doing CCD hygiene, but I suppose they've calculated the odds. I'd plug the AC adapter into my computer's UPS just in case Murphy's Law came into play.
I wonder what the tradeoff is with the "antishock" mirror custom setting. Slower "motor drive" speed?
I remember reading an article by Thom Hogan where he recommended you lock yourself in the room alone while cleaning your cameras CCD because of the number of horror stories he'd heard about children or pets tripping over the power lead and disconnecting it - with very expensive results!
The UPS idea is a good one: it's actually something I've recently been looking into myself since I'd far rather pay £80 for a UPS than risk £1000+ of damage if the AC power ever went off while I was cleaning the CCD.
The anti-shock mode simply introduces a short delay - about 0.5 seconds, enough for any vibration to subside - between the mirror going up and the shutter opening.