Lumicon 2 Inch Prime Focus Camera Adapter - Scratch and Dent DiscountLumicon 2 Inch Prime Focus Camera Adapter Scratch and Dent Discount! Minor blemishes do not affect performance Lumicon 2 Inch Prime Focus Camera Adapter drops into a 2 telescope eyepiece holder and presents male T threads (42mm x 0. 75mm) for T ring attachment. For prime focus photography where back focus is not critical, and for variable focal reduction on Lumicons Giant Easy Guiders, Giant Focal Reducers and Cassegrain Rich Field Viewer. Includes 2