... Coaxial coarse/fine focusing system, with up stop 2.12V/20W halogen lamp with brightness control 3. ... C, with coaxial coarse/fine focusing system, with up stop.--B, D, with coaxial coarse/fine focusing system, ... with tensional adjustable and up stop--A1,B1,C1,D1 is monocular head, A2 ... ,B2,C2,D2 is binocular head--12V 20W halogen lamp with brightness control SpecificationA11.0205 ...