Forums Photometry To do or not ? Aperture

Dr Paul Leyland

It’s not the size that is important, it’s how you use it.

You can do accurate photometry with telescopes of almost any aperture. The only thing that increased aperture buys you is a fainter limiting magnitude for a given exposure time.

People do precision photometry with nothing more than a DSLR and a standard lens. It is rare for the aperture of such a system to exceed 50mm, or half that of your telescope.