Hi Hemi,
Actually, you can get more subs than you think; as your target drifts
across the screen after each sub, DSS will align each next one with the previous one. So, if you start with your target say 25% off centre against the direction it will move, and keep shooting until it is about 25% off centre on
the opposite side of the screen [or viewfinder] you will get quite a lot of subs.
Incidentally, a 50mm lens gives round stars for about 9-10secs for a target
on or near the celestial equator,[using a static tripod], so you should be safe
doing 15 secs with your 24mm. In case you didn't know, as you move away from the C.E. you can increase the length of your subs quite substantially.
raymo
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