I’ve built a simple DIY intervalometer for deep-sky imaging, to enable my DSLR camera to take a series of photos of galaxies and nebula. It features a rotary dial with preset exposure times. When used with an autoguider setup, the intervalometer allows taking unattended exposures, while the telescope tracks a galaxy or nebula.
Related link: View all home-brewed DIY astronomy equipment
Night Sky in Focus | Astronomy and Amateur Radio © Anthony Urbano | Manila, Philippines