I like C mount, period, and wouldn't buy anything, astronomically speaking, that wasn't C mount - even just for telescopes. The SLR lens aspects are simply icing on the cake. To be able to add 2x, 3x, or 5x or slightly more, with a good field of view and plenty of light, usually very cheaply, because of the way NV works is just stupendous.
Think of it this way. Kevdog, getting lucky I should say, was able to buy a very nice Gen 3 TSE Prowler monocular for around $800. For $50 more, that's what I've paid for a Pentax based 135mm F2.8 and the Pentax to C mount adapter, you're right there at about 5x. Now it does depend on your viewing habits and what you want to ultimately do, but there's no other telescope system that you can pick up and walk out the front door with, in most of America or any city on the earth, and see all sorts of stuff that you can't see even with a much larger scope. So for $850 there is immediate access to the astronomical heavens. Actually, you should throw in some filters and that would immediately put it over a grand. That may be the best case scenario.
Now it also depends, some people never spend that much on a scope setup, but many of us spend thousands. If a person's going to spend $1500 or $2K or more on viewing the night sky, this is something to consider.
Some people buy eyepieces for their scopes, I buy scopes for eyepieces. Or I leave my 5x C mount setup in a drawer, when I want to use it I open the drawer with one hand, pickup my 5x DEEP SKY viewer with one hand, walk over to the front door and open it with one hand, while I'm holding my Deep Sky viewer in the other hand, go outside and can see more than 90% of the telescopes on the earth.
Alright, I might be exaggerating some, I'm not really sure, but C mount night vision systems should be considered by more telescope users. Though I would never urge anyone to buy NV equipment at the expense of "regular" astronomy. What I mean is buy both. If you're considering a regular telescope, get one. If you're considering any of this stuff, investigate it.
Edited by outofsight, 23 April 2018 - 03:29 PM.