Metabones
Adapter BTC EF to 4/3-mount w Booster
- Electronic Lens Adapter T 0.71x
- For MFT-mount Cameras
- For Canon EF Lenses
- Compatible with Pocket Cinema 4K
- Compatible with JVC GY-LS300
- Focus & Aperture Control
- Speed Booster increase 1 stop
- 0.71x Wider
BTC EF to 4/3-mount w Booster
- Compatible with all MFT mount cameras, including G9II, GH7, GH6, GH5, OM-1, OM-D, Blackmagic Cinema Camera, Blackmagic Pocket Cinema Camera and JVC GY-LS300.
- Autofocus
- Phase-detection autofocus (PDAF) on supported camera bodies*
- Iris/aperture controlled by the camera body
- Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lenses
- Image stabilization lens support (Canon IS, Sigma OS, Tamron VC)
- Support for cameras with in-body image stabilization (IBIS)
- Electronic manual focusing (e.g. EF 85/1.2L II, EF 50/1.8 STM and discontinued EF 50/1.0L)
- EXIF (focal length, aperture, zoom range)
- Distance and zoom display (requires lenses supporting distance information)
- Cinema EOS lens support (CN-E 18-80mm T4.4 L, CN10x25 25-250mm T2.95, etc.), including AF, auto iris and servo zoom (may require external power)
- LED indicator shows adapter status.
Mechanical
- The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.
- Flocking to reduce internal reflection.
- Rubber gasket protects the MFT mount connection from dust and moisture.
- AF may not work if the maximum aperture of the lens plus any EF Extender or other teleconverter attached is smaller than f/8.
- Some older third-party lenses may have unsatisfactory AF accuracy.
- No support for Focus Stacking and Focus Bracketing.
- Most EF-mount lenses are not silent but may make audible click noises during autofocus operation and iris changes which may be picked up by the built-in microphone of the camera. An external microphone is recommended for video.
- Use of Canon Cinema lenses such as CN-E 18-80mm T4.4 L IS KAS S and CN 10x25 25-250mm T2.95 for still photography is not supported. (Functional, but slower than lenses designed for still photography.)
- Iris changes are in 1/8 stop steps which may be noticeable in video recordings. Programmed exposure mode and shutter priority exposure mode should not be used for video. This limitation does not apply to Cinema EOS lenses which permit fine resolution iris control, such as CN-E 18-80mm T4.4 L IS KAS S and CN 10x25 25-250mm T2.95.
- No support for in-camera correction such as peripheral shading, CA and distortion

AF may not be accurate, but may be usable on a camera with PDAF (GH7, OM-1. etc.)
Incompatible EF-S lens (insufficient clearance, even if modified)
Unsupported List
Leica R
Super-Elmar-R 15mm |
Nikon F20/2.8 AI-S |
Olympus OM
OM 18/3.5 |
Pentax KEvery Pentax K-mount lens has a protruding fin and an aperture lever. It does NOT fit. |
Πηγή: https://www.metabones.com/products/details/MB_SPEF-m43-BTC