Lens Heaters: Why You Need One for Astrophotography – Space.com | Ad On Picture

Astrophotography often means taking your gear out in the cold and leaving it there, which can expose it to a number of problems. The first is foxes stealing your camera and having fun with it, but a more common and serious problem is condensation. Your camera and lens can be cooler than the surrounding air, causing water to condense on their surface. Get enough of it, and when your lens is tilted upwards, gravity will cause small drops of water to flow straight onto your camera body or the lens end of the lens to fog it up. Neither of these scenarios are good.

Cameras and water just don’t mix, despite advances in rubber gaskets and other seals to keep moisture out of sensitive areas. Fortunately, there are a few things you can do about it. Just as astronomers use heaters near telescopes to keep condensation off their expensive tubes, owners of the best cameras use it for astrophotography (opens in new tab) can protect their glass and camera body with it and prevent the formation of dew and condensation by gently heating the lens body.

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