Reducers / Flatteners
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TV-76 and TV-85
Model TRF-2008 0.8x Reducer/Flattener converts TV-85 to 480mm f/5.6 and TV-76 to 380mm f/5.0 for flat field, fast photography. Fully multi-coated 3-element unit with 48mm filter thread inserts directly into 2" focuser, accepts standard T-Rings for 35mm cameras. "This accessory is a must-have for someone planning to use the TV-85 photographically" - review in Sky & Telescope, July 1999. Also it can be used with any 400-600mm doublet refractor.
Use a spacing between top TRF-2008 flange and image sensor of 56mm +/-2mm for best results. A standard T-Ring fitted on a DSLR or mirrorless camera will achieve the correct distance.