You want a piece that looks like this. Plugs in like an eyepece, has t-threads that thread into the Celestron camera adapter. I paid no attention to the vendor, just wanted to show you what it looks like. Amazon has full kits.
You may need spacers, most imagers have a drawer full.
Heads up, since this is a DSO forum. That scope is difficult to break into imaging DSOs with, for a variety of reasons. Many try (because it IS a good visual scope, which is unfortunately not relevant, contrary to your intuition). The general rule (with very rare exceptions) is that they find it frustrating and not much fun.
The general solution is to keep it for visual only, and get a good mount (the most important part of a DSO imaging setup) and small refractor to start learning the complicated art of DSO imaging. Just one example (I have many), but a _really_ common experience.
"I regret spending the first 6 months trying to learn <DSO> imaging with an 8" Edge, with that scope it was a losing effort. Fortunately got a nice little refractor, and not only have the quality of my images improved but I'm actually enjoying the process of learning how to do it!"
The inexpensive workaround is a camera and a lens on a camera tracker. You can do excellent DSO images with that setup. In contrast, the big scope just messes things up. Did I mention this was not intuitive? <smile>
Planetary/lunar is completely different, because they are extremely bright compared to even so-called "bright" DSOs. But, for DSOs, this is not _remotely_ a simple matter of connecting a camera to a visual scope.
Edited by bobzeq25, 20 January 2021 - 02:13 PM.