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!