hi guys





recently i went to a trip and i had the chance to try my first Star trail picture.i had my 40D on the tripod,set the aperture to f 4 on my tokina 11-16mm lens and kept the shutter open for 40 minutes.i am happy with the result, being just a test shoot but my concern is that it took my 40D almost as long as 40-50minutes to process the shot.is this normal?it was set on jpeg+raw but i don't think this is the problem.my battery almost died during this.am i doing something wrong?can anyone tell me please?





thank you





qatarezu