My plan is to image the Dumbell Nebula, aka M27, tonight from the back yard.
I'll be using the following equipement:
William Optics 80mm triplet refractor with their reducer/flatener
Canon SL2 DSLR camera (unmodified)
Astronomics CLS clip filter
I will be autoguiding and so should be able to get nice long expsure times but that's where my question is. Just how long should I go?
The night before last I was taking 210 second exposures at ISO 800 and then had an issue that cut the power to the scope and ended the session early. Of course, I could just pick up where I left off and continue with the 210 sec ISO 800 images but I'm worried that they're over exposed. Even with the CLS filter, the unprocessed images coming right off the camera are almost white and I'm not sure that processing will fix it.
What do you guys recomend as far as exposure goes on M27 on a moonless night in the city with Bortle Class 6 light polution?
Edited by Clete, 23 October 2019 - 03:07 PM.