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This 3.5"" Tube Adapter Ring will fit any Astro Physics 4.875"" female threaded Optical Tube Assembly

Use with focuser FTF3545B-A

Specifications

Use with FT3500 Series
Known To Fit Astro-Physics Threaded Optical Tube Assemblies
Thread on Entry (OTA | FRONT) Side of Draw Tube 4.875""