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Yes Prime focus is when you put the camera where the eyepiece normally goes. If you have an eyepiece there and then a camera that is called eyepiece projection and it will increase the magnification and ergo the complexity and reduce the guiding tolerance.
If you plan to do mainly observing a fork is OK but they have problems when you go close to the pole (Small Magellenic Cloud for example) because the camera can touch on the base of the mount. GEM is certainly the prefferd option for imaging scopes in our size bracket.
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