Skip to content

How To Determine The Optimal Subexposure Level For Astrophotography

Many beginning astrophotographers are confused about how long each of their subexposures should be. I know that was true for me!

There is a lot of good information on the net but I wasn’t aware of anything that covered the process from beginning to end so this video does just that.

This is what it covers:

  • 1. The formula for optimal exposure level
  • 2. The range from minimally acceptable to optimally good exposure levels
  • 3. How to measure the parameters of your camera
  • 4. How to estimate when you can’t perform the measurements (perhaps you are considering buying a camera and want to see how it would compare to your current camera).
  • 5. How to evaluate your individual subs for exposure and clipping in PixInsight
  • 6. How to evaluate your subs in Sequence Generator Pro

Here is the link to Jon Rista’s post on Cloudy Nights: https://www.cloudynights.com/topic/597682-i-need-a-primer-on-read-noise-calc-asi1600/#entry8200280

Here is the link to the page where you can find the 2DPlot script as well as many other useful PixInsight scripts: http://www.skypixels.at/pixinsight_scripts.html.

This video doesn’t get into theory but concentrates on practice. I hope this is helpful. If there is anything that isn’t clear or you find a mistake, please let me know.

ERRATA: When I discuss the scaling from the camera bit depth to 16 bits, I erroneously said the scaling was 8 for the ASI294 when it is actually 4. Proof something three times and I still don’t catch an error until it is out the door…

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Enter your email address to follow this blog and receive notifications of new posts by email.

Where You Can Find Me

%d bloggers like this: