Leica Order No. – 11137-silver – 11136-black Production era – 1980-1998 < 29,853 lenses Variants – Black, silver, ELC; 1st version with telescoping shade that covers f-stop ring when not deployed Lens mount – Leica M-bayonet Number of lenses /groups – 5 /4 F stop range – f/2.8 – f/22 Closest focusing distance – 1 m Smallest object field – 220 x 330 mm Diaphragm setting /type – 11-blade Angle of view diagonal – 27 degrees Filter type – E49 (1st) – E55 (2nd) Accessories – E55 Cap 14289 – Rear Cap 14269 Materials – Black anodized aluminum or silver lacquered brass E49 Dimensions length x diameter – 79 x 67 mm / 3.11 x 2.64 in E55 Dimensions length x diameter – 77 x 63.5 mm / 3.03 x 2.50 in Weight – 475 g /1.05 lb in black; 690 g / 1.52 lb in silver Inscriptions – LEITZ SUMMICRON-M 1:2/90 3XXXXXX LEICA SUMMICRON-M 1:2/90 E55 3XXXXXX