In article , ad607@FreeNet.Carleton.CA says...
>The rest of the suggestions here are right on the
>money... just my 2ø worth...

Uh, mine weren't. Ma memory faded.... The other posters were more correct in their exposure recommendations. As I thought back, again,
I remembered f5.6 and 1/2 for K64 (or somewhat over f8 with 100 ASA).
I used to like to hand-hold the exposures and shake the camera while
the shutter was open (and multiple-expose the frames) with fireworks
- not very realistic, but fun images resulted.
Hope This Helps