In order to use EAGLE CORE together with a telephoto lens (and guide scope in parallel) you have to add "140mm PLUS dovetail bar" to be connected under EAGLE CORE body, in order to install everything on the equatorial mount. In the upper part the Eagle Core has a 1 1/4" photo thread to connect a photo ball head and then the camera. If you have an heavy photo lens (for example with focal length higher than 200mm) you can add the "PLUS Vixen+Losmandy dovetail clamp". Then you can connect the "PLUS 90mm Vixen dovetail bar" under the camera and then connect everything in the dovetail clamp. The guide scope is installed, using the optional 80mm PLUS guide rings and PLUS raisers, to be fixed on the side of EAGLE CORE.