Limiting magnitude?

Paul Leyland

Hi James,

Could you report your practical limiting magnitude of your equipment please? For example, what is the faintest you can reliably measure to within 0.1 magnitudes after a 10 minute exposure?

I’m toying with getting a small equatorial mount for a Canon DSLR / telephoto lens combination and your experience will help set expectations for a roughly 50mm aperture.

There are limits to what can reasonably be extrapolated from something approaching two orders of magnitude greater light grasp!