Yes, that’s right. Light polluted skies, a DSLR, and a lens. There is actually a detailed manual here…
The introduction states …
“You’re out jogging one night in your usual park. It’s dark, but you know the area well, so you don’t have a
fear of running into anything. Tonight turns out to be different, though. As you jog you notice someone
just off the path with a camera on a tripod. Strangely, you notice that both her gaze and her camera are
pointed up, right up to the sky above. You glance up at the sky as you jog past seeing just the brightest
points of light in your light-polluted sky. What could she be doing? In this case, the woman, who is a High
School history teacher by day, is performing measurements on the brightness of certain stars, data that
will be of use and interest to professional astronomers. She’s one of a growing breed of people called
“citizen scientists.” This manual will show you how you can participate as well.”