Leica Summicron V4 / Sony A7R

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The Leica 50mm Summicron-M f/2.0 lens, also known as the "50mm Summicron V4," is a manual focus lens that was produced by Leica from 1979 to 1994. Here are some key features and specifications:
Focal length: 50mm
Maximum aperture: f/2.0
Minimum aperture: f/16
Number of diaphragm blades: 8
Lens construction: 6 elements in 4 groups
Minimum focusing distance: 0.7m
Filter size: E39 (39mm)
Weight: approximately 195g
This lens is known for its sharpness and overall image quality, and is a popular choice among Leica enthusiasts and photographers who appreciate the high standards of Leica lenses. The "V4" designation refers to the fourth version of this lens, which features improved coatings and a slightly different design compared to earlier versions. It is compatible with all Leica M-mount cameras, as well as with some mirrorless cameras via adapter.