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Assuming you telescope is a 1.25 inch diameter eyepiece.
Celestron sells adapters on Amazon for Canon and Nikon. It basically turns your telescope into a lens. There are also tele-extenderstele-extenders that allow you to put your eyepieces in between the telescope and camera for more magnification. As for brands, I can give a qualified answer as I'm biased towards Canon. I have heard and read that a full-frame camera, even an older model will do you more wonders than a newer crop sensor.