these couplers are for using Nikon / Contax rangefinder lenses on Leica screw mount cameras, some lenses do not work, i was unable to mount the 21 biogon on the orion, or the stewarty coupler. the Cook & perkins is for 5cm lenses only (internal mount lenses) , the last couple (always mis-represented when sold on ebay) is for close-up work only. (it was sold as a set in the late 40's early 50's as a close-up/ macro unit for the contax camera , most have lost the rest of the rings that go with it. )
the 21mm biogon needs to have the flange on the rear of the lens removed to allow the lens to fit on the orion coupler, not sure what the dimensions of your lens is to tell if it will fit on the couplers,
jim
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