I have had a lot of trouble with an SB-28dx on my D100. I set the camera in manual to 1/200 (defaults to 1/180), f5, ISO 200 and the flash to auto mode. My relatively close photos (less than 10 ft)are all underexposed by 1 to 2 EV.
I am curious to hear how you are setting your flash, both external and built-in, and what kind of results you are getting.
Thanks for your input.
A Chicago Nikonian
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#1. "RE: Settings for flash on D100" | In response to Reply # 0AlanC Basic MemberSat 10-Aug-02 04:46 PM
Two problems I can think of here: first the camera will only sync at speeds up to 1/180 sec (which is why you were seeing that as a default) and second that it seems to underexpose by about 0.7EV when you're using D-TTL metering. I can't vouch for the latter when using an external flash (still haven't got around to trying my SB-28DX on the camera), but it certainly seems true for the built-in flash.
P.S. I just noticed you said you had the flash in auto mode... I'd guess the underexposure is down to the 1/180 sec maximum sync speed.