Metabones

Metabones T II ULTRA Speed Booster T 0.71x Adapter w/ Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BT4) Review

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Metabones T II ULTRA Speed Booster T 0.71x Adapter w/ Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BT4)
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Our take
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Our editorial take on the Metabones T II ULTRA Speed Booster T 0.71x Adapter w/ Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BT4)

The Metabones Speed Booster T II ULTRA 0.71x adapter bridges Canon EF glass to Sony E-mount bodies, a well-established solution for hybrid shooters and filmmakers who want to retain their EF collection. The 0.71x optic design widens the field of view and increases maximum aperture by approximately one stop, effectively turning full-frame Canon lenses into faster, wider equivalents on APS-C Sony sensors. The T II ULTRA generation uses Metabones' advanced five-element optical design to minimize aberrations and maintain edge sharpness. The integrated support foot is a practical addition for balancing heavier telephoto lenses on smaller mirrorless bodies. Electronic contacts pass through autofocus and aperture control, though performance varies by lens and camera generation. At $288, this sits in the mid-range of the Speed Booster lineup and competes directly with alternatives from Sigma and Viltrox, but Metabones remains the reference standard for build quality and optical consistency in the speed booster category.

Best for: Sony E-mount shooters with existing Canon EF lenses who need reliable electronic communication and optical correction.
What's great
  • 0.71x speed boost increases aperture by roughly one stop
  • Widens field of view on APS-C Sony bodies
  • Integrated support foot for lens balance
  • Electronic passthrough for autofocus and aperture control
  • Five-element optic minimizes aberrations
Watch outs
  • Autofocus speed and accuracy depend on lens and camera pairing
  • Premium pricing compared to third-party alternatives

Synthesized by Geared editors from early expert reviews.

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Overview

About this product

Metabones T II ULTRA Speed Booster T 0.71x Adapter with Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BT4) | Metabones T II ULTRA Speed Booster T 0.71x Adapter w/ Support Foot for Canon EF-Mount Lens to Sony E-Mount (MB_SPEF-E-BT4) - LN- - Like New Minus - w/ Caps

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Legacy
false
Condition Grades Seen
ln
Keh Merchant Product Id
379219-2462117
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  • KEH
    used● In stockBest price
    $288
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