Hello all - long time no post - it's a long story. Anyway, going to head out on my roof tonight (about 0300 hours 08/13 AZ time) to photograph the Perseids. Any tips on lens, f-stop, ISO, etc would be appreciated. Using a Canon XSi, have a Tamaron 17-35mm 2.8-4 as well as Canon 18-55mm. Know to take off the AF as well as IS when shooting. It is now 1930 hours (08/12) AZ time. Thanks for any and all assistance.