Kinefinity EF 3 Mounting Adapter

The Kinefinity A230-001-01 EF 3 Mounting Adapter is a rock-solid, tool-free EF lens adapter for MAVO and TERRA cameras, featuring full electronic iris control, AF support, active locking ring, and follow-focus compatibility in a featherlight 200 g CNC-metal body—perfect for run-and-gun cinematographers who demand zero back-focus hassle and instant lens swaps.

Engineered for seamless Canon EF integration, the Kinefinity A230-001-01 EF 3 Mounting Adapter transforms any MAVO (Edge 8K/6K, mark2, LF) or TERRA 4K into a full-frame EF powerhouse. Gold-plated electronic contacts transmit aperture, IS, and EXIF data while enabling servo-zoom and autofocus on compatible lenses (Sigma ART, Canon CN-E, etc.). The patented active-locking ring clicks lenses in with a satisfying 60° twist—no tools, no play, no shims required thanks to precision factory calibration. A geared iris ring works flawlessly with any 0.8-mod follow focus, and the recessed flange design prevents lens damage during swaps. At just 200 g and finished in space-grade anodized aluminum, it adds virtually zero bulk yet supports cine primes up to 5 kg.

Key features

• Full electronic EF control (iris, IS, AF, EXIF)
• Tool-free active locking ring (60° secure twist)
• 0.8-mod geared iris ring for follow focus
• Zero-shim factory calibration (no back-focus adjustment)
• Supports lenses up to 5 kg
• Recessed flange for lens protection
• Gold-plated contacts + weather-resistant sealing