How to stop lens fog for astro photography

Lens fog can ruin your astro timelapse shoot. In this article I show you how to solve this moist problem.


If you've ever gone out to shoot some astro timelapses or photos chances are you've had a frustrating experience with your lens fogging up.

This is caused by water molecules in the air. As the air cools down at night, these water molecules have to go somewhere. Depending on the temperature of your gear, they'll gladly settle on your lens! No one likes a foggy lens, so let's fix that!

In this video I show you what you can do to stop your lens from fogging up.

You can use the calculator on this website to find out the dew point for your area.

Depending on this dew point you might not need a lens warmer, but it's a good idea to have one in your camera bag anyway.

One option to stop your lens from fogging up is to use a cut up sock and some ski hand warmers that you can find in most adventure stores. Fellow London based timelapse photographer Henry Young warned me that these are really bad for the environment, so I won't be linking them here!

Another option is to get an electric lens warmer that you wrap around your lens and attach to a battery. There are so many to choose from these days, and they're all very affordable. Someone in my Youtube comments told me that the one I showed in the video worked well for them, so you can find that one here. (Amazon affiliate link)

an image of an electric lens warme

Apparently you can also use this one to heat up your coffee mug!

If you'd like to learn more about timelapse or astro timelapse photography, check out my e-books below. The first 20 people to use code “lensfogsucks” get $10 off their entire order!

Get all the best tools and techniques to become a great timelapse photographer.

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