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Metabones MB-126 Canon EF to Emount T-Speed Booster ULTRA 0.71x.

SKU: MB-126
  • Increase maximum aperture by 1 stop
  • Canon EF Lens to Sony E-Mount Body
  • Increase angle of view by 0.71x
  • Weather-Resistant Rubber Mount Gasket
  • Switch for In-Body Image Stabilisation
  • Smooth Iris with Select Adapted Lenses
  • Support for Phase & Contrast-Detect AF
  • Programmable Function Button; Status LED Light
  • Transfers EXIF Data to Camera
  • Weather-Resistant Rubber Mount Gasket




The Metabones MB-126 T Speed Booster ULTRA II 0.71x allows a Canon EF lens to be mounted onto a Sony E-Mount camera. While doing so, the adapter’s optics help to maximise the connected lens’s apparent angle of view by 0.71x while providing a 1-stop increase for the camera over the lens’s aperture range.

Adapter for Canon EF Lens to Sony E-Mount

With the Metabones T Speed Booster Ultra 0.71x Adapter, Canon EF lenses can be attached to a Sony E-Mount camera. It reduces the crop factor from 2.0x to 1.4x to capture a 0.71x wider angle of view, effectively mitigating the crop factor of the APS-C sensor.

One Stop Aperture Increase

The adapter condenses light and projects a full frame image onto a APS-C sensor, providing a 1 stop increase of aperture over all of the lens’ f/stop settings. In doing so, it maximises the lens’ wide angle capabilities, giving you more compositional flexibility.

Enables Electronic Communication

The Metabones T Speed Booster lens adapter allows your camera to communicate with attached lenses. Thanks to this electronic interface, original camera features and setting adjustments, such as modes and aperture, remain available to the user for full shooting functionality. It also allows for EXIF metadata generated by supported lenses to be saved on camera. By doing this, information such as focal length, aperture and zoom range are automatically tagged for easy file organisation and an uncompromised workflow.

Supports Autofocus, Manual Focus and IS

The Metabones T Speed Booster Ultra 0.71x Adapter gives photographers the option of using either manual mode or autofocus if it’s present on your lens. Camera and lens image stabilisation are also supported with the adapter so users don’t have to sacrifice function for convenience.

Sophisticated 5 Element, 4 Group Design

The T Speed Booster Adapter boasts a patented 5 Element, 4 Group design. Incorporated with a tantalum-based optical glass, the adapter helps deliver sharp images with true colour accuracy.

Refined Build Quality

The aluminium build of the Ultra 0.71x Adapter keeps its weight low while brass mounting rings minimise wear and tear to improve durability. The adapter’s interior has also been coated in matte black to keep reflections to a minimum.

Locking Mechanisms and Threads

The Canon EF to Sony E-Mount Metabones T Speed Booster Ultra 0.71x Adapter has a locking push-button lens release mechanism for a secure fit to the camera. A detachable Arca-Swiss compatible tripod foot with 1/4-inch threads is included for use with longer lenses, allowing you to mount them on a tripod for better balance and stability.


Camera Mount: Sony E (APS-C)

Lens Mount: Canon EF

Magnification: 0.71x

Optical Design: 5 Elements in 4 Groups

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