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LEICA calls this the LEICA 50mm SUMMICRON f/2 with near-focusing range.
Laymen also call it the "Dual Range" and "DR."
Many lenses, like the 1957 sample seen here, are marked 5cm instead of 50mm.
7 elements in 5 groups.
Not clear here are that the first two elements are separated by about 1.52mm.
4 elements are of LaK9 glass.
Single-coated.

Hood Built-in
Made in Germany
Filter 39mm
Cân nặng 335g chrome

Compatible Brand: For Leica
Focal Length: 50mm
Camera Type: Rangefinder
Camera Technology: Analog & Digital Type: Standard, Prime
Focus Type: Manual
Brand: Leica
Maximum Aperture: f/2 Model:
Summicron M50mm 4th 11826C
Mount: Leica M Series: Leica SUMMICRON-M

Brand Leica
Compatible Brand For Leica
Compatible Filter Size 55 mm
Compatible Lens Front 55 mm
Country/Region of Manufacture Canada
Exterior Material Aluminum
Focal Length 50mm
Focus Type Manual
Maximum Aperture f/2
Model Summicron R 50mm f/2 R-only
Mount Leica R
Series Summicron R