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The Vixen Digiscoping Balance Rail is a ~6" (150mm) long chunk of metal with a track-slotted screw for your spotting scope and a 1/4"-20 socket for your tripod head on the bottom.
When you've attached a digital camera to the rear of a Geoma spotting scope, the ideal balance point of the scope/eyepiece/camera combination changes-because the assembly's rear gains weight, it would be better if the scope's tripod foot was ahead of the tripod head's center. This rail allows that change, minimizing vibration, and has enough travel for the scope mounting screw to achieve an ideal balance no matter which Geoma scope + eyepiece/adapter/camera combination you're using.