Simmod Mamiya 645 Lens to Canon EF Camera Adapter with P-Lock

Mamiya 645 lenses were designed for a medium format system with a dedicated mount.

This adapter provides a mechanical interface to EF-mount camera systems.

The Simmod Mamiya 645 to EF Adapter enables Mamiya 645 lenses to be mounted onto Canon EF and EF-S cameras, maintaining proper flange distance and optical alignment.

Function

• Adapts Mamiya 645 mount lenses to Canon EF mount cameras
• Provides a fixed mechanical interface between lens and camera
• Maintains correct spacing for focus accuracy

Mount Interface

• Lens side: Mamiya 645
• Camera side: Canon EF

The adapter installs between the lens and camera body, allowing compatibility without modifying the original lens mount.

Construction

• Precision-machined metal construction
• Matte black internal finish to reduce reflections
• Designed for consistent fit and alignment

Mechanical Performance

• Maintains flange focal distance required for EF mount
• Supports infinity focus
• Provides a stable, play-reduced connection
• Preserves optical alignment between lens and sensor

System Behavior

• Fully mechanical adapter
• No electronic communication between lens and camera
• Manual focus and manual aperture operation only

Installation

• Attaches directly to the Mamiya 645 lens mount
• Mounts onto EF camera body using standard EF bayonet
• No modification to the lens required

Notes

• Designed for lenses with manual aperture control
• Does not transmit EXIF data or electronic signals
• Does not alter optical characteristics of the lens

A mechanical adapter designed to mount Mamiya 645 lenses onto EF camera systems while maintaining proper alignment and focus performance.