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Vixen t-Rings are especially designed for eyepiece projection or prime focus photography. A high quality T-Ring vital to ensure the film plane that is square to the optical axis. These T rings from Vixen accomplish that while minimizing any flexure. TRings from Vixen used to attach a digital camera body to a camera adapter for photography through a Vixen telescope . Also Vixen T Rings can be used for astrophotography in conjunction with other prime