Quote:
Originally Posted by luka
I have seen that "deep-space people" make, for example, 5 x 5min exposures - this should be equivalent to, for example, 150 x 10sec exposures? It would be a real pain to take photos and stack them all (I have done 200 x 5sec exposures) but it should work even with a dob?
Or am I missing something important here.
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Welcome!
You will find that 5x5min is not nearly the same as 150x10sec - the 5x5 will show a lot more depth. I think even a 5 sec exposure at a deep sky object through a Dob will trail badly.
Dobs have their advantages - just none of them are photographic advantages unfortunately!