› Forums › Variable Stars › Advice on variable star photometry setup › Limiting magnitude?
1 May 2020 at 7:40 pm
#582381
![](https://britastro.org/wp-content/uploads/2018/09/picture-8621-1537263177-80x80.jpg)
Participant
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!