Unless you want to get into full astrophotography, depending on your mount, it shouldn't get expensive. If you have a tracking mount, about all you'd need is a coupler to attach your camera to your scope. I have a 16" dob in an observatory, but it doesn't have tracking, so I'm content not to go "deeper" in that direction.
That's a great shot of the moon!
Nicely done.
For the first shot of the moon, you defintely got a winner! Detail is excellent! Brian I'm aquainted with aperture fever; I started with an 8" dob, ending up with the 16" and an Observatory! I also have 60mm & 80mm refractors. Right now however, my main interest is photography.
I'm suprised that you turned your eyes from your garden to the moon , very nice shot Brian