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Metabones Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x Mark II

BH #MESPEFM43BTC • MFR #MB_SPEF-M43-BTC
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Metabones Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x Mark II
Key Features
  • Canon EF Lens to Micro Four Thirds Body
  • Supports In-Camera Aperture Control
  • 0.71x Micro 4/3 Crop Factor Compensation
  • Stores Profile Data for Supported Lenses
The Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x Mark II from Metabones enables you to mount a full-frame Canon EF-mount lens on a Micro Four Thirds-mount camera. The adapter's optics effectively reduce the crop factor of mirrorless Micro Four Thirds cameras from 2.0x to 1.4x while providing a one-stop aperture increase. This Mark II 0.71x adapter features lens data profile storage, auto focus, image stabilization, and PDAF (phase-detection AF) support for select lenses and cinema EOS lens support for auto iris and servo zoom.
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Metabones MB_SPEF-M43-BTC Overview

The Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x Mark II from Metabones enables you to mount a full-frame Canon EF-mount lens on a Micro Four Thirds-mount camera. The adapter's optics effectively reduce the crop factor of mirrorless Micro Four Thirds cameras from 2.0x to 1.4x while providing a one-stop aperture increase. This Mark II 0.71x adapter features lens data profile storage, auto focus, image stabilization, and PDAF (phase-detection AF) support for select lenses and cinema EOS lens support for auto iris and servo zoom.

Mark II Technology
This adapter stores lens profile data for select lenses and has an LED indicator that turns pink when a matching profile is found and the Mark II technology is active.
Key Features
  • Enables a full-frame Canon EF-mount lens to be used with a Micro Four Thirds-mount camera
  • Maximizes apparent angle of view of combined camera and lens
  • Cinema EOS lens support, including AF (requires external 5V power via micro-USB port), auto iris, and servo zoom
  • Provides a one-stop increase for the camera over the lens's aperture range
  • Supports electronic communication between camera and lens to enable autofocus, PDAF (phase detection AF), image stabilization, on-camera aperture control, and EXIF metadata generation for select lenses
Design
  • Internal coating to minimize reflections within the adapter barrel
  • Detachable, Arca-type tripod foot with 1/4"-20 thread
  • Aluminum components for weight reduction
  • Brass mounting rings for preventing wear and tear
  • Locking mechanism for secure attachment of lens with push-button release

Metabones MB_SPEF-M43-BTC Specs

Item Type
1x Reducing Lens Mount Adapter
Camera Compatibility
Micro Four Thirds Mount
Lens Compatibility
Canon EF Mount
Magnification
0.71x
Electronic Communication
Yes
Exposure Change
1-Stop Light Gain
Optical Design
5 Elements in 4 Groups
Included Shims
Inputs/Outputs
1x Micro-USB Power Input
Mounting
Tripod Mount: 1/4"-20 Female Thread
Materials
Aluminum, Brass
Packaging Info
Package Weight
0.685 lb
Box Dimensions (LxWxH)
4.8 x 4.7 x 2.2"

Metabones MB_SPEF-M43-BTC Reviews

Works like an OM lens

By Joe
Rated 5 out of 5
Date: 2026-06-18

works perfect. Canon lens behaves just like an OM PRO lens. Nice to have the amber light that shows the lens is registered in the processor

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