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Metabones Canon EF to MicroFourThirds T CINE Speed Booster XL 0.64x (MB_SPEF-m43-BT6)
A new Micro-4/3 mount Speed Booster adapter designed exclusively for the Panasonic GH4 and other selected Micro Four Thirds cameras, with a magnification of 0.64x. The Speed Booster XL 0.64x uses an advanced 6-element optical design to achieve extraordinary optical performance at apertures up to an incredible f/0.80, a new record for Micro Four Thirds format.
The new Speed Booster XL 0.64x 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. When the GH4 is used in Cinema 4k video mode the horizontal full frame crop factor is reduced from 2.34x to 1.50x, thus effectively transforming the GH4 into a super-35 format 4k cine camera. In addition, the speed of any attached lens is increased by 11/3 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.
Compatibility
The Speed Booster XL 0.64x is similar to the Blackmagic-specific 0.64x BMCC Speed Booster (MB_SPEF-BMCC-BM1), but has been completely re-designed to meet the following requirements:
• The working distance has increased by 1mm to permit use on the Panasonic GH4 and a number of other Micro Four Thirds cameras without touching the flexible outer cover of the camera’s shutter mechanism.
• The optics are optimized for a standard Micro Four Thirds filter stack thickness of 4mm rather than the 2.4mm found in Blackmagic cameras.
• The image circle diameter has been increased to 21.63mm so that the full 17.3mm x 13mm Four Thirds format is covered. This has been achieved while maintaining unusually high image quality over the 17.4mm image circle used by the Panasonic GH4 in its Cinema 4k video mode.
Autofocus with an Optimum Balance of Accuracy, Speed, Consistency and Reliability
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.
Autofocus Lens Compatibility
Accurate | Tested by the community, thanks! | Accurate only on newer cameras such as Panasonic G7, GX8 and GX80/85 |
Canon EF 8-15mm f/4L USM Fisheye* | Canon EF 70-200mm f/2.8L IS USM (Mark I) | Canon EF 70-200mm f/4L USM (non-IS) |
Inaccurate | Require external USB power supply owing to high current consumption; AF inaccurate | |
Canon EF 50mm f/1.8 II | Tamron 28-300mm f/3.5-6.3 XR Di VC A20 | |
Does not fit, even after modification | Manual focus only | Not supported |
| Canon EF-S 18-135mm f/3.5-5.6 IS Nano USM | Contax N lenses modified by Conurus | Focus confirmation "chips" |
* with smooth iris support
| Adapter type | speed booster |
| Adapter is for cameras | micro 4/3 |
| Adapter is for lenses | Canon EF |
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