[Dboots (Duncan)]

Hi,

I have been toying with astrophotography with a 14" goto dob and Canon 60d. I know that a dob is not the best tool for astrophotography but I have to use the tools I have.

I am now looking at stacking for Deep Sky Objects. Can you please let me know:

1. is it better to use high ISO (stacking will eliminate the noise) or should a use a lower ISO (stacking will amplify the faint image)?

2. What would be the best (longest) length of exposure to minimize any rotational effects from the dob?

2. should I process the photos before stacking or process the stacked result (or both)?

Please let me know if these questions have been asked before and, if so, where I can find the answers.

Also, I have attached a single 20 second exposure picture I took of the Lagoon Nebula as a starting point for future comparison.

Thank you in advance,

Duncan