Lens mount – LEICA R-bayonet for LEICA R3 to LEICA R9 with mechanical, and, for LEICA R8/R9, additional electronic exposure control
Variants – Black, Safari green, R-only and 3-cam versions Number of lenses/groups – 6 / 4 Focusing range – 0.5 m / 19.7 in < ¡Ä Aperture range – f/2-f/16 – Preset diaphragm with clickstops (including half values), 6-blade fully automatic diaphragmSmallest object field/Largest reproduction ratio – 180 mm x 270 mm / 1:7.5Angle of view (diagonal, horizontal, vertical) – 47¡Æ, 40¡Æ, 27¡ÆPosition of entrance pupil – 20.2 mm / 0.8 in (related to the first lens surface in light direction)Scales – Combined meter/feet graduationFilter mount/Lens hood – Internal thread for screw-in type filters E 55 / Built-in, telescopicAccessories – ELPRO close focusing attachments type 1 and 2Viewfinder – Camera viewfinderMaterials – Anodized aluminum and optical glassFocal length – 52.5 mm / 2.07 inLength to bayonet flange – 41 mm / 1.6 inLargest diameter – 66 mm / 2.6 inWeight – 290 g / 10.2 ozInscriptions – LEICA SUMMICRON-R 1:2/50 E 55 3XXXXXXLEITZ SUMMICRON-R 1:2/50 3XXXXXXSUMMICRON-R 1:2/50 LEITZ CANADA 3XXXXXX