Best slide film for loooooooooong exposures?

[b_slow]

I mainly shoot with a DSLR now, but I'm going to be using the old film body for some nice long star shots (>45 minutes). I've used Velvia 50 and 100F, Provia 100F, E100VS, E100SW, Sensia, etc--but never much for really long exposures. Also, I've heard that some of these have color shifts after a certain amount of time.

Does anyone have any recommendations?
Thanks.

[another view]

Always had good luck with Provia 100F and 400F but my looooooooooooong exposures are rarely more than an hour. They really don't have much in the way of color shift - unlike Velvia 50 which turns everything green. Can't comment about the others - have used them but not like this.

[b_slow]

Yeah, I was leaning toward Provia anyway. Glad to hear that you've tried something similar and didn't experience any color shift. Have you got any of those photos online?

[another view]

Mmm... no but I'll see if I can dig one up.

[GB1]

I like the blacks of Kodachrome 64