I do not have a telescope; rather, I have an Olympus camera body with one of their longer superbly built lenses. It's 100 to 400mm. Internal to the camera is an electronic feature (the 2X extender) that will increase the reach of the lens. For my moon photos, I always use that, along with having the lens all the way out to 400mm.
I also have the F-stop wide open; when the lens is out to 400mm, the camera can get to F-6.4. The camera also is mirrorless so I can see what I'll get before I take the photo. And there's a dial for exposure compensation that allows me to play with the exposure.
There's a lot of technical stuff going on inside the camera and lens that I don't understand, but I do know how to use the features I've mentioned above.
Thank you for asking! I'm up right now because I couldn't sleep for worrying about something that I cannot do anything about, and you've distracted me, which I sorely needed!
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