The Vixen flip mirror is an ingenious solution for viewing in a straight line or at a 90-degree angle . The viewing angle can be changed by turning a wheel . The main connection features a 50.8 mm barrel, which is then reduced to one of the two 31.7 mm receptacles. There is also a T2 thread for a DSLR camera when the 31.7 mm eyepiece is removed. This allows you to connect your camera directly to the telescope with an optional T2 ring .