I explored my Nikon D200's manual and it appears that it does multiple exposures (up to 10) to create 1 image. You can either have the camera compute the exposure of each release (it's called "auto gain") or do it yourself. You can use any shooting mode (single, continuous low, continuous high or mirror lockup). The only limitation (other than 10 exposures) is that you cannot have more than 30 seconds between releases; no way to change that. I remember with my film multi-exposure surf photo waiting several minutes for a big set to come in; sometimes there was only one big hit per set... My guess is that the D300 or D3 may improve on this capability. I'd be curious to know if any of the Canon digital offerings have this capability. Hopefully the M9 will... Bob Bob Adler Palo Alto, CA http://www.raflexions.com