The Speed Booster XL 0.64x uses an advanced 6-element optical design, with a magnification of 0.64x, to achieve extraordinary optical performance at apertures up to an incredible f/0.80, a new record for Micro Four Thirds format. Designed for the Panasonic GH4 and other selected Micro Four Thirds cameras, it reduces the full-frame crop factor of the Panasonic GH4 from 2.0x to 1.28x, thus effectively transforming these cameras into APS-H format
Optimised
Like all Metabones Speed Boosters, the Speed Booster XL 0.64x is optimised to fully account for
a camera’s filter stack located near the sensor surface4. This is especially critical at the
extremely large apertures made possible by Speed Booster technology.
As a result of this careful optimisation, an enormous range of full-frame optics, ranging from vintage film lenses to the latest digital designs, will function flawlessly when adapted to compatible Micro Four Thirds
camera bodies. In fact, most lenses will have significantly improved MTF when used with the
Speed Booster, compared to using them with a plain (i.e. “glassless”) adapter on Micro Four
Thirds cameras.
Fast
In addition, the speed of any attached lens is increased by 1 1/3 stops, with a maximum output
aperture of f/0.80 when an f/1.2 lens is used. For example, a 50mm f/1.2 becomes a 32mm
f/0.80, which is the fastest aperture available for full size Micro Four Thirds format.
Perhaps most exciting of all, in addition to increasing lens speed and field of view, the Speed
Booster XL 0.64x offers amazingly high image quality even at extremely large apertures.
Autofocus
New in Speed Booster XL for Canon EF Mount to Micro Four Thirds is autofocus support, subject to certain limitations (see table above for details). We are pleased to report that Panasonic Micro Four Thirds camera bodies are capable of autofocusing accurately even if the maximum aperture of the Speed Booster and the lens combined is in the sub-f/1.0 range. Although our first and foremost priority is accuracy, we are able to make great strides in autofocus speed as well.
Features and benefits
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Limitations
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Optical
- Increase maximum aperture by 11/3 stop
- Increase MTF
- Makes lens 0.64x wider
- Patented 6-element/4-group optical design by Caldwell Photographic in the USA
- Supports 4k video mode with DX lenses (except on GH5).
Electronic
- Autofocus
- Can be powered either by camera body or by third-party external 5V power source (not included)
- 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 (IS) lens support
- Support for cameras with in-body image stabilization (IBIS), including Panasonic GX7, GX8, GX80/85 and Olympus cameras
- Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
- EXIF (focal length, aperture, zoom range)
- Distance and zoom display on camcorders (requires lenses supporting distance information)
- Canon Cinema EOS lens (CN-E Compact-Servo) support, including AF (requires external 5V power through micro USB port), auto iris and servo zoom
Other
- Detachable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads.
- The opening is flocked with felt material to reduce internal reflection.
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- Supports only Panasonic GH5, GH4, GH3, G3, G5, G6, G7, G10, GF3, GF5, GF6, GX1, GX8, GX80/GX85, Olympus E-PL7, PEN-F, Blackmagic Cinema Camera with Micro Four Thirds mount**, Pocket Cinema Camera*** and Micro Cinema Camera***
- EF-S lenses require modification to fit or may remain incompatible even after modification (but third-party DX lenses can be used without modification)
- On GH5, Speed Booster XL can be used with full frame lenses only. DX lenses are unable to cover full-sensor-width readout + in-body image stabilizer (IBIS)
- EF-S and third-party DX lenses do not cover the full Micro Four Thirds sensor in still photo and FHD video (but will cover 4k video mode on GH4, GX8 and GX80/85).
- No video AF for Olympus
- AF may not work if the maximum aperture of the lens plus any EF Extender or other teleconverter attached is smaller than f/8 before boost or smaller than f/5.1 after boost.
- AFC (continuous AF) and AFF (flexible AF) modes are not supported, except on Olympus OM-D E-M1.
- Panasonic video AF may hunt more than a native lens or have unsatisfactory performance.
- Some Tamron lenses may have unsatisfactory AF accuracy.
- No support for Focus Stacking and Focus Bracketing on Olympus.
- On Olympus, other than E-M1, you may move the single AF point among any of the 81, but you may not multi-point AF. There is no restriction on E-M1 and Panasonic.
- Very early Olympus models (e.g. E-PL1) have no autofocus support.
- 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 Compact-Servo lenses such as CN-E 18-80mm T4.4 L KAS S for still photography is not supported.
- 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.
- No support for in-camera correction such as peripheral shading, CA and distortion
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