A:AnswerI think your telescope has a 1/4 20 thread to connect the base to it's included tripod. Unless you broke the original Celestron tripod, I would not replace it with this.
A:AnswerAs long as your camera has the screw hole on the bottom, the tripod has the piece with the screw that will go into it. This tripod has worked well with my video cameras (Canons) and DLSRs (Nikon) that are moderately heavy.
A:AnswerI have a Nikon D3200. The tripod has a standard threaded mount that attaches to the bottom of the camera. The mount then attaches to the tripod with a latching mechanism. So, you can easily take the camera on and off of the tripod. I believe that all Nikon cameras have the same threaded mount on the bottom of the camera. It seems that this threaded mounting is a universal for all cameras.
A:AnswerIt works with small cameras with a hole in the bottom for it to screw into. It works great with my Sony 5100 trail camera. Very happy with this tripod.
A:AnswerIt will work with the Canon T7 and extends at least to 5 feet using the elevating head. However, the elevating head becomes unstable the higher it goes, so I wouldn't use that feature much with something like a DSLR on it. Unless you have accidental damage insurance on your camera.
A:AnswerThe phone is mounted sideways, and then the tripod head is rotated as needed. The grip is strong so the phone doesn't fall down when vertical, especially if you have a cellphone cover.
A:AnswerYes, the only thing I would recommend is to not extend the tripod all the way out because although it is sturdy, you would be mounting something that weighs probably double the tripods weight.