Milky Way Time-Lapse Settings Calculator

Please bookmark this page so you can use the calculator without providing an email.

Go back to instructions (opens new tab) ->

Check out our Milky Way Photography Checklist ->

Milky Way Time-Lapse Calculator

Choose how round you want your stars. 400 Rule allows slightly longer exposures; NPF is sharper but uses shorter exposures (dimmer image unless you raise ISO/open aperture).
Find the mm number printed on your lens. Use the widest focal length (smallest mm) for more sky and longer shutter time.
Use the lowest f-number listed on your lens (widest aperture) to let in the most light—especially important for Milky Way shots.
Enter how long you want the final video to be. The calculator uses this to determine the number of photos you’ll need at 24 fps.
Pick your sensor type/crop factor. Full-frame is 1.0x; APS-C and Micro 4/3 are smaller sensors and affect your shutter limit.
Type your shooting location and click Go to find its Bortle rating in a new tab. Then come back and select the matching Bortle level.
Choose how dark your sky is (1 = darkest, 9 = brightest). Higher Bortle numbers make the Milky Way harder to see.

The Bortle scale measures night sky brightness. 1 is darkest, 9 is brightest.

About Carly Stocks & Dark Sky Utah

Carly Stocks is an award-winning photographer who is passionate about teaching others how to capture the Milky Way. Carly spent seven years teaching high school physics and now brings her expertise to her courses and content. She’s spent years photographing the Milky Way and honing her skills. From presenting at the NightScaper Conference, being published in USA Today, and winning international photography competitions, she’s learned what works. Carly has developed workflows and techniques that remove the guesswork, so you can easily capture night sky images you’re proud of. 

Milky Way Course