[batema (Mark)]

Sometimes when looking at the iformation provided on some of the photos I see a number of shots have been stacked however there might be 10 sec with 30 sec and 60 sec shots stacked. Is there a benefit in stacking different timed shots of the same image???? Also If you shoot 10 shots of something how many darks should you take?? We have not built anything yet to allow us to take flats however we have a connon 400d that comes up with the self cleaning sensor. Do we need to take flats?? Thanks Mark.