Simmod EF Lens to Sony E Body Positive-Lock Adapter

Canon EF lenses were designed around a friction-based mount system.
Sony E-mount cameras rely on a different mechanical standard.
This adapter bridges the two with a fixed, locking interface.

The Simmod EF to Sony E Positive-Lock Adapter is a precision-machined adapter that enables Canon EF-mount lenses to be mounted onto Sony E-mount cameras, while introducing a positive-locking mechanism to improve mechanical stability.

A Locked Mount Interface

Unlike conventional EF adapters that rely on spring tension, this system uses a stainless steel positive-locking collar.

• The EF lens is inserted and mechanically clamped into position
• Torque is distributed evenly around the mount
• Rotational play and micro-movement are minimized

This approach creates a more rigid interface compared to standard friction-based adapters. (B&H Photo Video)

Compatibility

• Lens mount: Canon EF
• Camera mount: Sony E
• Compatible with Sony E-mount bodies including:
  • FX3, FX6, FX30
  • A7 series, A9, A1
  • FS and NEX series cameras (B&H Photo Video)

No electronic communication is supported. This is a fully mechanical adapter.

Construction

• Body constructed from high-grade aluminum
• Stainless steel locking ring for durability
• Internal surfaces feature anti-reflective coating to reduce stray light (B&H Photo Video)

Mechanical Performance

• Maintains accurate flange focal distance
• Supports infinity focus with ~0.005mm tolerance (B&H Photo Video)
• Designed for zero-play engagement under load
• Includes optional shim adjustment for calibration (B&H Photo Video)

Support and Mounting

• Integrated support foot
• Includes:
  • 1/4"-20 thread
  • 3/8"-16 thread

This allows the adapter to be supported directly on rods or tripod systems, reducing stress on the camera mount. (B&H Photo Video)

System Behavior

• Converts EF lenses to operate on Sony E-mount bodies
• Maintains optical alignment through fixed flange distance
• Does not provide autofocus or electronic control
• Designed for use with manual or cine-modified lenses

Notes

• Not a smart adapter, no electronic passthrough
• Intended for controlled, mechanical lens operation
• Designed for use in cine rigs, follow focus systems, and stabilized setups (B&H Photo Video)

A mechanical adapter designed to convert Canon EF lenses to Sony E-mount cameras using a positive-locking system to reduce play and maintain alignment under load.