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It really depends on the target selected. Something bright like Orion you can do even in a short exposure, even 10-15 seconds is good. It's really all on the target selection. And the longer the exposure the more you will see, within reason. Attached are the single images taken with a Canon 70D. The Tarantula Nebula (30s, ISO 1600) & Orion Nebula (15s, ISO 1600). Neither has been edited at all.
NOTE - this is with my 102mm refractor.
Last edited by Drac0; 05-01-2022 at 03:38 PM.
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