Metabones Canon EF Lens to Sony E Mount T Speed Booster ULTRA 0.71x

Metabones Canon EF to Sony E-Mount T Speed Booster ULTRA 0.71x
The Metabones Canon EF to Sony E-Mount T Speed Booster ULTRA 0.71x is a premium, highly advanced optical adapter designed to mount full-frame Canon EF lenses onto APS-C and Super35 format Sony E-mount mirrorless cameras and camcorders. Far more than a simple mechanical adapter, the Speed Booster ULTRA features a custom-designed 5-element optical matrix by legendary designer Caldwell Photographic. By compressing the light from a full-frame lens down onto a smaller sensor, it widens the field of view, increases light transmission by a full stop, and dramatically sharpens image resolution.

Equipped with a highly responsive electronic interface, it supports native autofocus, dual-mode stabilization tracking, and complete exposure control for a seamless, professional cross-platform shooting experience.

Optical Compression & Light-Gathering Performance
0.71x Focal Length Reduction: Condenses the image circle of a full-frame Canon EF lens to match the smaller footprint of an APS-C or Super35 sensor. This reduces the camera’s crop factor from 1.5x down to roughly 1.07x, effectively restoring the wide-angle perspective of your full-frame glass.

+1 Stop Maximum Aperture Boost: Concentration of light increases the lens’s maximum light transmission by a full F-stop. For example, a standard f/2.8 zoom becomes a lightning-fast f/2.0 lens, and an f/1.4 prime transforms into an ultra-bright f/1.0 optic, significantly improving low-light handling.

Caldwell Photographic 5-Element Optics: Built around an advanced 5-element, 4-group optical configuration that utilizes ultra-high index tantalum-based glass. This specialized formula actively reduces aberrations, minimizes vignetting, and improves corner-to-edge sharpness compared to standard adapters.

Anti-Reflective Internal Flocking: The interior barrel is treated with a specialized matte-black felt flocking compound to absorb internal reflections, ensuring high contrast and zero internal flare even when shooting directly into backlight.

High-Speed Electronic Integration
Intelligent Hybrid Autofocus Support: Features a powerful 32-bit bit-stream processor that handles complete electronic communication between the lens and the camera body. It supports both high-speed Phase-Detection AF and precise Contrast-Detection AF on compatible Sony camera bodies.

Dual-Mode Autofocus Protocol Toggle: Equipped with a physical button on the side of the adapter to cycle between two electronic modes:

Green Mode: Optimizes power consumption and enables standard operational workflow configurations.

Advanced Mode: Accesses modern camera utilities like eye tracking, face detection, and continuous movie autofocus (dependent on camera body generation).

Optical Stabilization & EXIF Metadata Mapping: Transfers comprehensive lens data directly to the camera body, ensuring accurate EXIF metadata logging (including adjusted focal length and aperture calculations). It supports Canon’s lens-based Image Stabilization (IS) alongside Sony’s in-body 5-axis image stabilization (IBIS).

Smooth Electronic Aperture Custody: Allows the physical exposure values to be dialed in directly from the camera’s control wheels. It fully supports standard exposure modes, including Program, Shutter Priority, Aperture Priority, and Manual control.

Rugged Mechanical Engineering
Chromed Brass Bayonet Mounts: Both the camera-facing and lens-facing mounts are precision-machined from heavy-duty brass and coated in durable chrome, ensuring rigid, flex-free alignment and smooth mounting for heavy cinema or telephoto lenses.

Detachable Arca-Swiss Tripod Foot: Outfitted with a heavy-duty, removable tripod foot featuring a native Arca-Swiss compatible quick-release profile, alongside standard 1/4″-20 threads to shift heavy lens weight off the camera’s lens mount during tripod deployment.

Rubber Weather-Sealing Gasket: Integrated with a durable rubber weather gasket at the Sony E-mount interface to protect the camera sensor and electronic connection points from dust and moisture on location.

Technical Specifications
Adapter Type: Optical Focal Reducer / Speed Booster

Lens Compatibility: Full-Frame Canon EF Mount Lenses (Not compatible with EF-S or third-party APS-C lenses)

Camera Mount: Sony E-Mount (APS-C / Super35 / Full-Frame in Crop Mode)

Magnification Factor: 0.71x

Aperture Gain: +1.0 Stop

Optical Formulation: 5 Elements in 4 Groups

Weight: Approx. 8.5 oz (241 grams)