A non-contacting rotary connection for transmission of optical signals across an interface defined by two relatively-movable members comprising: a first rotary connection element (18, 118); a second rotary connection element (19, 119) configured to rotate about a primary axis (x-x) relative to said first rotary connection element; said second rotary connection element having a first subassembly (33, 134A) configured to rotate about a first rotational axis (31, 131) with rotation of said second rotary connection element about said primary axis relative to said first rotary connection element; said second rotary connection element having a second subassembly (34, 134B) configured to rotate about a second rotational axis (30, 132) that is not parallel to said first rotational axis with rotation of said second rotary connection element about said primary axis relative to said first rotary connection element; a rotary interface (20, 120) between said first rotary connection element and said second rotary connection element; said second rotary connection element comprising a first collimating lens (21, 124) and a second collimating lens (22, 125); said first rotary connection element comprising a third collimating lens (23, 121) and a fourth collimating lens (24, 122); said first and said third collimating lenses configured to direct an optical signal between each other in a first optical path (P1, P10) across said rotary interface; said second and said fourth collimating lenses configured to direct an optical signal between each other in a second optical path (P2, P20) across said rotary interface; one of said first collimating lens and said third collimating lens orientated coincident with said first rotational axis and the other of said first collimating lens and said third collimating lens orientated parallel to or coincident with said first rotational axis; one of said second collimating lens and said fourth collimating lens orientated coincident with said second rotational axis and the other of said second collimating lens and said fourth collimating lens orientated parallel to said second rotational axis; whereby an optical signal may be transmitted across said rotary interface between said first rotary connection element and said second rotary connection element in said first optical path and an optical signal may be transmitted across said rotary interface between said first rotary connection element and said second rotary connection element in said second optical path. a first rotary connection element (18, 118); a second rotary connection element (19, 119) configured to rotate about a primary axis (x-x) relative to said first rotary connection element; said second rotary connection element having a first subassembly (33, 134A) configured to rotate about a first rotational axis (31, 131) with rotation of said second rotary connection element about said primary axis relative to said first rotary connection element; said second rotary connection element having a second subassembly (34, 134B) configured to rotate about a second rotational axis (30, 132) that is not parallel to said first rotational axis with rotation of said second rotary connection element about said primary axis relative to said first rotary connection element; a rotary interface (20, 120) between said first rotary connection element and said second rotary connection element; said second rotary connection element comprising a first collimating lens (21, 124) and a second collimating lens (22, 125); said first rotary connection element comprising a third collimating lens (23, 121) and a fourth collimating lens (24, 122); said first and said third collimating lenses configured to direct an optical signal between each other in a first optical path (P1, P10) across said rotary interface; said second and said fourth collimating lenses configured to direct an optical signal between each other in a second optical path (P2, P20) across said rotary interface; one of said first collimating lens and said third collimating lens orientated coincident with said first rotational axis and the other of said first collimating lens and said third collimating lens orientated parallel to or coincident with said first rotational axis; one of said second collimating lens and said fourth collimating lens orientated coincident with said second rotational axis and the other of said second collimating lens and said fourth collimating lens orientated parallel to said second rotational axis; whereby an optical signal may be transmitted across said rotary interface between said first rotary connection element and said second rotary connection element in said first optical path and an optical signal may be transmitted across said rotary interface between said first rotary connection element and said second rotary connection element in said second optical path.