Simmod EF Lens to L-Mount Body Positive-Lock Adapter

The Simmod EF to Leica L-Mount Positive-Lock Adapter is a precision-machined adapter designed to mount Canon EF lenses onto Leica L-Mount camera systems while minimizing rotational movement and maintaining mechanical alignment.

Mount Interface

• Lens mount: Canon EF
• Camera mount: Leica L-Mount

The adapter installs between the EF lens and L-Mount camera body, creating a fixed mechanical connection intended for cinema-oriented workflows.

Positive-Lock System

Unlike standard friction-based EF adapters, the adapter uses a stainless steel positive-locking collar.

• The EF lens is inserted into the adapter
• The locking collar mechanically clamps the lens into position
• Torque is distributed evenly around the mount surface
• Rotational play and mount shift are reduced during operation

The locking mechanism functions similarly to a PL-style locking interface.

Construction

• CNC-machined aerospace-grade aluminum body
• Stainless steel locking ring
• Matte black anti-reflective internal coating
• Black and silver anodized finish

The adapter is manufactured to maintain dimensional consistency and structural rigidity under load.

Mechanical Performance

• Maintains proper flange focal distance for EF to L-Mount conversion
• Supports infinity focus
• Designed for approximately 0.005mm tolerance accuracy
• Shim-adjustable flange depth available for calibration

The rigid locking structure is intended to minimize movement during:

• Follow focus operation
• Gimbal use
• Cine rig configurations

Support System

Integrated support foot includes:

• 1/4"-20 mounting thread
• 3/8"-16 mounting thread

This allows the adapter to be supported on rods or tripod systems to reduce stress on the camera mount.

Compatibility

Compatible with Leica L-Mount systems including:

• Leica SL series
• Panasonic LUMIX S series
• Sigma FP series
• Blackmagic Cinema Camera 6K and PYXIS 6K

System Behavior

• Fully mechanical adapter
• No autofocus or electronic communication support
• Manual lens operation only
• Does not alter optical characteristics of the lens

Notes

• Intended for manual or cine-modified EF lenses
• Designed for cinema workflows involving support systems and follow focus accessories
• Proper support is recommended when using heavier lenses or motor-driven rigs