Home » Tutorial » How To Successfully Photograph a Total Lunar Eclipse “Blood Moon”
Moon Tutorial Wide Field

How To Successfully Photograph a Total Lunar Eclipse “Blood Moon”

Shooting a “blood moon” total eclipse is not the same as a standard moon photo.

Don’t worry, shooting a total lunar eclipse is easy. But, you have to do it right, and knowing a few things before you start can really help. I’ve compiled a few of the sticking points that can trip you up during the process. Hopefully my past mistakes won’t be yours! Let’s get to it.

1. Use fast optics with a low possible focal ratio

This doesn’t make sense for the moon, but it does this time. Normally we don’t talk about using a fast lens for shooting the moon. But, this isn’t your normal moon imaging session! When the moon is fully eclipsed and hiding in the shadow of the earth, it will be very dim.

At the beginning of the eclipse (the penumbral phase), you will be shooting the moon like normal, at fractions/hundredths of a second. By the time the moon is fully cloaked in the earth’s shadow (the umbral phase), your exposures will be measured in seconds, even with higher ISO usage. So, in order to keep your images as noise-free as possible using a lower ISO, faster optics with a wider aperture will help!

2. Use a tracking mount for longer focal lengths

If you want to focus on up-close features of the moon, filling the frame and using a very narrow field of view, you will need a tracking mount once the “blood moon” effect takes over to avoid motion blur.

Why? At the totally eclipsed point, exposure length required to capture the “blood moon” will be in numbers of seconds (even with a higher ISO) instead of fractions of seconds used to capture a moon photo.

What’s a longer focal length? Anything past 100mm or longer or so is going to suffer motion blur on a static tripod in order to properly expose during the “blood moon” totality stages, unless you’re using a VERY high ISO speed and short, noisy, exposures.

3. What camera settings you should use for a total lunar eclipse

I’d love to be able to simply say “Use this exposure, aperture, and ISO,” like we do in our DSLR astrophotography cheat sheet, but I can’t really do that because as the eclipse moves through its phases, everything changes, constantly. It’s also very equipment dependent. Are you using telescope? A fast wide lens? A fast mirror telescope with a large aperture, or a small aperture refractor?

However, what I can tell you, is that you should test your setup BEFORE the eclipse starts, knowing it will change considerably over a matter of hours. As a starting point, when the moon is full, test your camera at an exposure time of around 1/400s, ISO 100, and a stop or two from wide open aperture and play around with the exposure time until you’ve got a good starting point, be sure not to overexpose! Don’t adjust too often after that.

Important! Watch your histogram!

Once you’ve got your starting point sorted out, adjust exposure time longer as needed (watch your histogram!) as the penumbral eclipse starts and moves towards umbral and totality. When the exposure time reaches into the seconds (1 or 2 seconds or so), start adjusting the ISO higher, and then play with shutter speed again.

ISO: 400
Exp: 1/125s
Aperture: f/8

Important! Remember how doubling the ISO halves the required shutter speed for the same exposure! So, halve the shutter speed every time you double the ISO to get the same exposure.

ISO: 400
Exp: 1/40s
Aperture: f/8

After the umbral phase completes and the moon starts to move out of the earth’s shadow, it will get slowly brighter at the same rate that it dimmed towards totality, just in reverse order. The same rules apply, just in reverse: Start by shortening exposure time, then lowering the ISO, doubling the exposure time, and repeating until you get back to your starting point at the end of the eclipse and normal life resumes.

ISO: 3200
Exp: 1.6s
Aperture: f/8

4. Prepare your camera gear appropriately!

The sequence is LONG, especially during the July 2018 eclipse, during which start to finish is around 6 hours — be prepared!

Things to think about:

5. Don’t forget to take it all in, look up, and enjoy the view!

As with all things astrophotography, the best thing you can do is get out there, practice, and use your gear. Knowing your camera and lenses is half the battle. Enjoy the view!

Like this article enough to buy the author a drink? (a small donation of $1-$20)

About the author

Cory Schmitz

Co-founder of PhotographingSpace.com, co-owner of several telescopes and mounts, too many cameras, and not enough hard drives, Cory is an American expat living in South Africa with his wife, Tanja Schmitz.

An avid astrophotographer for timelapse, deep-space imaging, lunar, planetary, and star trail imagery, he is an all-around jack-of-most-trades for night-sky photography.

He is also an internationally published and commissioned astrophotographer, where his photos have been used in multiple online and print publications.

3 Comments

Click here to post a comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  • Dear Cory, thanks for the useful advices. I´ll try it with a canon 400 mm f5.6 lens, tripod and no tracking mount. Do you think it will be possible to get decent photos?

    Jose

    • Hi Jose!

      You might be fine with that as long as you don’t expose for too long, just make sure you keep the aperture wide open and boost the ISO to compensate when things get dim during totality! But note, with Mars close by, even a wide shot will be amazing!

      Cheers and good luck!
      Cory

From PhotographingSpace.com:

From our Friends at PrimaLuceLab

Sponsored advertisement

Astrophotography Photoshop Actions!

Make your Milky Way POP and finish off your photos like a pro with our Photoshop Action Packs optimized specifically for astrophotography!

YOU can shoot amazing AP!

%d bloggers like this: