Thanks for the pointer to the 900NC review - I'm surprised Philips would come up with something so unsuitable for mounting to a scope given that they must know how many people fell in love with the 840K. OK, astrophotography's a niche but still...

I've got a Kodak DX6490, and it too takes movies for as long as there's space on the card (512MB in my case, so about half an hour). However, my brief experience with the iSight is telling me that more, shorter movies are better than one long one - certainly when it comes to extracting the good frames for image stacking.

I've now found a place that allegedly has 840Ks in stock, so the credit card is twitching.
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simon