Metabones T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount (EOS M) Camera

SKU: MBSPEFEFMBT1 MFR: MB_SPEF-EFM-BT1
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Key Features

  • Maximize your Canon EF lens potential on EOS M with this Speed Booster adapter.
  • Achieve a brighter f/0.9 aperture, enhancing low light photography with ease.
  • Maintain image quality; this adapter's optics sharpen images, reduce aberration.
  • Convert focal length by 0.71x, getting wider shots with your existing lenses.
  • Enjoy broad compatibility: adapts Canon EF lenses to Canon EF-M mount cameras.
  • Robust build quality ensures secure lens mounting and years of reliable use.
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Special Order?Estimated to Ship: 08/22/2025
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Shopper : Why Did You Choose This?PATRICIA D : I needed this so that the lens would be compatible with my camera. I chose this adapter because it would not limit the capability of my lens like other adapters would.

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Metabones T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount Camera Specifications

  • Adapter Type

    Speed Booster

  • Compatibility

    Canon EOS M series camera
    Canon EF-mount Lens
    Canon EF-Extender (Teleconverter)
    Carl Zeiss EF-mount Lens
    Sigma EF-mount Lens
    Tamron EF-mount Lens
    Tokina EF-mount Lens
    Contax N mount lenses modified to Canon EF by Conurus
    Contax 645 NAM-1 adapter modified to Canon EF by Conurus

  • Maximum Output Aperture

    f/0.9

  • Camera Mount

    Canon EF-M

  • Lens Mount

    Canon EF

  • Magnification

    0.71x

  • Optical Design

    5 Elements in 4 Groups

  • Tripod Mounting Thread

    1/4"-20 Female

  • Dimensions (Dia x D)

    2.8 x 1.1" (7.0 x 2.7cm)

  • Weight

    7.51 oz (213g)

  • UPC Code

    4897050182314

Models
Metabones T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount Camera
$479.00

Special Order

Generally ships in 7-14 days, subject to availability

Novoflex Adapter for Sony Alpha/Minolta AF Lenses to Canon EOS M Cameras
$249.00

$324.00

Save:$75.00 (23%)

Temporarily On Backorder

Although this item is temporarily on Backorder, you can order it now and it will ship as soon as it arrives. Your card will only be charged once item is shipped.

Viltrox EF-EOS M2 0.71x LMA for Canon EF-Mount Lens to Canon EF-M-Mount Camera
$156.00

Special Order

Generally ships in 7-14 days, subject to availability

FeaturesSpeedBooster / BaveyesBasic AdapterFull AF Adapter, SpeedBooster / Baveyes
Camera Fitting (Male)Canon MCanon MCanon M
Lens Fitting (Female)Canon EOS EFSony Alpha / Minolta MaxxumCanon EOS EF

About Metabones T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount Camera

An innovative and high-quality accessory for photography enthusiasts, the T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount (EOS M) Camera is a versatile tool that enhances your camera's performance. This durable adapter, manufactured by the reputable brand Metabones, is designed to convert your Canon EF lens to an EF-M mount, making it compatible with a Canon EOS M camera.

The T Speed Booster ULTRA 0.71x Adapter is equipped with an advanced 5-element/4-group optical design that incorporates ultra-high index tantalum-based optical glass. This sophisticated design ensures extraordinary optical performance, delivering improved corner sharpness, reduced distortion, and minimized vignetting.

Like its predecessor, the revolutionary original Metabones Speed Booster launched in 2013, this ULTRA version also offers a magnification of 0.71x. This feature effectively reduces the crop factor of mirrorless cameras with DX-sized sensors (APS-C), such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x.

The ULTRA design utilizes exotic materials at the cutting edge of glassmaking technology, resulting in a product that is well-corrected for use with virtually all full-frame SLR lenses, regardless of exit pupil distance. This makes the Speed Booster ULTRA a top performer with professional-grade f/2.8 zoom lenses like the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon, transforming them into 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively.

The T Speed Booster ULTRA 0.71x Adapter also works well with high-speed fixed focal length lenses such as a 50mm f/1.2, converting it into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center to the edges of the image.

Key features of this compact adapter include an increase in maximum aperture by 1 stop (with a maximum output aperture of f/0.9), an increase in MTF, and the ability to make the lens 0.71x wider. It also supports autofocus, image stabilization (IS) lens support, and Video Digital IS support (on supported camera bodies).

The adapter is powered by the camera body, eliminating the need for an external power source with most lenses. It also features a detachable tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads, and a rubber gasket to protect the EF-M mount connection from dust and moisture. The adapter's construction combines aluminum alloy and brass with chromium plating, and it has a satin surface finish for a sleek, professional look.

Metabones T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount Camera Features

  • T Speed Booster ULTRA 0.71x Adapter for Canon EF to EF-M Mount Camera

Warranty Information

This product has a limited warranty of 12 months.

Key Features

  • Maximize your Canon EF lens potential on EOS M with this Speed Booster adapter.
  • Achieve a brighter f/0.9 aperture, enhancing low light photography with ease.
  • Maintain image quality; this adapter's optics sharpen images, reduce aberration.
  • Convert focal length by 0.71x, getting wider shots with your existing lenses.
  • Enjoy broad compatibility: adapts Canon EF lenses to Canon EF-M mount cameras.
  • Robust build quality ensures secure lens mounting and years of reliable use.

What's in the box:

  • T Speed Booster Ultra 0.71x Adapter
  • Front Cap
  • Rear Cap
  • Tripod Foot Key
  • Metabones 1 Year Limited Warranty