Angenieux Retrofocus R21 10mm f/1.8 C-Mount Wide Angle Lens Parts No Barrel

Angenieux Retrofocus R21 10mm f/1.8 C-Mount Wide Angle Lens Parts No Barrel

This is the optical assembly from a P. Angenieux Retrofocus R21 10mm f/1.8 wide-angle lens, sold AS-IS for parts. The barrel and mount are not included — buyers receive the optical/lens assembly only. P. Angenieux (Angenieux Paris) was a French optical manufacturer renowned for high-quality cine and broadcast lenses; the Retrofocus R21 was part of their C-mount 16mm cine lens line and is a collectible vintage optical component.

Specifications & What's Included

• Brand: P. Angenieux, Paris, France
• Series: Retrofocus R21
• Focal Length: 10mm
• Maximum Aperture: f/1.8 (marked 1:1,8)
• Lens Type: Wide Angle, Retrofocus (reverse telephoto) design
• Mount: C-Mount
• Focus: Manual
• Serial Number: 786924 (engraved on barrel)
• Included: Optical assembly only
• Not Included: Outer barrel, focus/aperture ring assembly, and mount — these are absent

Applications

The Angenieux Retrofocus series was designed primarily for 16mm film cameras and C-mount cine cameras, where the retrofocus (reverse telephoto) optical design allows a short focal length to achieve a longer back-focal distance — necessary for cameras with reflex mirror mechanisms. The R21 designation refers to the lens family within Angenieux's C-mount line. These lenses were used in documentary filmmaking, scientific and industrial imaging, and broadcast applications from the 1950s through the 1970s. Today, bare optical assemblies like this are sought by technicians repairing or rebuilding Angenieux lenses, by optical engineers for custom instrument or machine vision builds, and by collectors. C-mount optics also see use in modern machine vision cameras and some mirrorless camera systems with appropriate adapters.