A few nights ago I was far away from city lights looking at stars and taking photos. I had my C11 and a Sony A7RIII camera with a .7 reducer. I usually start out the night by doing eyepiece viewing for an hour or so to let optics stabilize and to wait for darker skies. When I do astro photos I often take very high ISO, short exposure, photos to center the image and adjust focus. After I got home and was looking through my files I noticed my single 40,000 ISO, 5 second, exposures looked better than my stacked 1600 and 3200 ISO photos. After cleaning up my images in Lightroom the high ISO images still looked better so I deleted most of my stacked photos to clear some memory. I was surprised at the results I got. I have read several articles about high ISO photos sometimes having less noise, depending on the camera, but losing out on dynamic range. I am going to start experimenting with higher ISO, sort duration photos more often to see what I can get. It might work well in my light polluted neighborhood where I can't take photos for longer than 60 seconds, even with a light pollution filter.
5 second exposure
Edited by Jeffmar, 25 August 2019 - 02:14 PM.