Hi Deb Went out this AM at 4, set up and found M31 but couldn't really see Comet Bradfield all that well. I did this from my from yard (in a WELL lighted neighborhood) and with my digital camera and did learn a few things. I had the camera set at 800ASA equivalent using a 105mm lens (equal to 150mm on the digital) set at F2.8 wide open AND an exposure OF 30 sec. mounted on my C8 sidesaddle. I got a decent exposure of the sky and M31 but missed Comet Bradfield due to the camera being aimed more north than needed. I'll attempt this again from the 9300' level of Mt.Haleakala Sunday morning IF we have clear weather. With your OM-1 and a film of 400ASA (at F2.8 or 4), I'd start exposures at 1 minute and go up to 8 minutes and do this from a dark sky location w/ a good view of the horizon. I do believe that you'll be successful .............. Aloha,have fun Rob