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A male M54 to M42 thread adaptor suitable for connecting an EFW2/3 or OAG to an M42 ‘T’ thread connection on a telescope or reducer. Adds 1 mm to back focus.A male M54 to M42 thread adaptor suitable for connecting an EFW2/3 or OAG to an M42 ‘T’ thread connection on a telescope or reducer. Adds 1 mm to back focus.