The International Space Station and the Space Shuttle Discovery in the north just passing the Big Dipper. Discovery (left) tails the space station (right) as the space station moves into Earth Shadow. taken from our backyard outside of Yarker Ontario on 2009Sept09 at 21:43 EDT The compact cameras will take a 15 sec exposure immediately followed by a 15 second dark frame to do some internal processing. Often it would result in a missed pass or framing opportunity while waiting for it to cycle. Canon powershot A540 compact camera on a tripod. 15 second exposure f2.6 @ 6mm