https://www.dpreview.com/forums/post/64629918
Wow he got such an amazing Orion Nebula image with a Canon superzoom camera that can't do longer than 15 sec exposures at ISO 100. He uses the same DSS freeware for stacking that I have, but the one difference is key, he has a tracking mount and I dont have that. Cant even see Polaris here to do an alignment. He did 41 frames 15 sec each at ISO 100. I wonder if I can do 246 frames at 2.5 sec each at ISO 100....but since I have a M43 camera, I can actually use much higher ISO to achieve a similar result too....and I dont even have to use ISO 3200 like in my image! I could do 31 frames at 2.5 sec each at ISO 800....or I could do 24 images at 2.5 sec each and ISO 3200 and let the stacking take care of the noise (but would nebular colors be blown out at that exposure level and high ISO?) He said it's 184mm, is that EFL? If so mine is 150mm EFL. I dont think his can be actual focal length because that would be around 1000mm EFL which would nearly fill the frame with the Orion Nebula I think?