Imaging solar system objects and imaging deep space are completely different activities, require completely different setups and techniques. So there are different forums here for each.
I'll talk DSOs. This forum is mostly about DSOs.
Nebulae and some other targets are really big. So, you do not want to magnify them because they wouldn't fit on the chip in the camera. Here are the Pleadies, an excellent starter target, would work well with your 72 and a DSLR. Click on this thumbnail for a better version, and details about how it was done.
Most galaxies are small (Andromeda though, is _four_ full Moons wide, another good starter target).
What makes this work is not magnification, it's two other things. You gather a lot of data including many long subexposures of your subject. 20 3 minute subs combined is a good starter level, one hour of "total imaging time". You process the data intensively on a computer. You need good software for that, a good starter program is Astro Pixel Processor.
The most important part of the setup is NOT the scope. Or the camera. It's an excellent mount, your eyes compensate for motion when looking through the telescope, the camera doesn't. A good one for the 72 would be an HEQ5 or iEQ30. About $1500.
The telescope that did the image above was a 100mm. A bit large to start with, far better would be your 72. This is _really_ unintuitive. The mount was a $2500 CEM60, needed for the larger scope.
If that's too much money, the solution is to shorten the focal length, a lot, by using a camera lens instead of a telescope. That reduces the effect of tracking errors (which are always an issue). Then you can use a $300-500 "camera tracker". The setup looks like this.
It's a lot of fun. It takes time to learn to do it well, the pretty pictures do not come easy. It's both complicated and unintuitive, you need to study how to do it. Here's a good place to start, quite beloved on this site.
That's enough for now. There's way more to this than fits on a short post. Get the book. Spend some time reading the Beginning and Intermediate Imaging forum.
Yes, it's complicated (very). The good news, a charm of the hobby for many of us, is that you will never run out of new things to learn.
Edited by bobzeq25, 26 March 2023 - 10:37 AM.