Two of the most popular webcams used in astrophotography: Logitech Pro 4000 (left) and Philips SPC900NC (right).

The modest web camera (or webcam) quickly gained interest among amateur astronomers and is now considered as the equipment of choice for planetary imaging because it has two characteristics that are very much useful in astrophotography: (1) its lens can be removed much like the lens of a DSLR, making it possible to easily connect the webcam with any telescope and (2) it can record a huge number of still frames even in a short span of time (1-2 minutes), a feature particularly useful in a post-processing technique called registering and stacking.

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Photo of Saturn taken on May 8, 2016. Image captured through eyepiece projection method with a 4-in f/9 refractor, UV-IR filter, a 5 mm eyepiece, and a Logitech Pro 4000 web camera. Processed using AutoStakkert and Registax.

In this article, I intend to describe how to image planets using a web camera as the main imaging device and then provide a brief overview of the post-processing technique. Read more.

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