The Micro Four Thirds format offers some significant benefits, not just in terms of cost, but also in performance and size compared to DSLR. The latest crop of mirrorless cameras from Panasonic such as the Lumix G7, the latest GX8 and the venerable GH4 offer internal 4K recording at reasonable and manageable bit rates, affordable recording media and the option to adapt various third party lenses via adapters. Even though there are a number of very good MFT native electronic lenses such as the Lumix 12-35mm f2.8, which includes image stabilisation (one of the best all-rounder lenses for the GH4 in my opinion) most shooters prefer to also adapt 3rd party lenses. The Metabones adapters from the Speed Booster line offer this ability and them some – as in the case of the Speed Booster XL, which not only allows for an extra stop of light, but also brings up the FOV to that of a Super 35 chip with a 1.5x crop in 4K DCI Cinema mode on the Panasonic GH4.
Metabones did also recently announce a new Speed Booster ULTRA 0.71x in both Canon EF and Nikon F mounts, and just a few days ago they also released the latest firmware update 1.7 for their Canon EF to MFT Speed Boosters, enabling autofocus support for Panasonic cameras and fixing some bugs.
See details of Firmware Update 1.7 for the following models below:
Canon EF to Micro Four Thirds Speed BoosterAdapter (model number MB_SPEF-M43-BM1)
Canon EF to Micro Four Thirds Speed BoosterS Adapter (model number MB_SPEF-M43-BM2)
Canon EF to Micro Four Thirds T Speed Booster XL 0.64x Adapter (model number MB_SPEF-M43-BT3)
Canon EF to Micro Four Thirds T Speed Booster ULTRA 0.71x Adapter (model number MB_SPEF-M43-BT4)
ABOUT THIS DOWNLOAD
Name: Firmware update V1.7 for Canon EF to Micro Four Thirds Speed Booster
Release date: 24 July 2015
Benefits and improvements
Autofocus for Panasonic cameras
Fixed a camera-becoming-unresponsive issue after double-tapping on the touch screen of a Panasonic camera
Fixed EF Extender recognition issue with EF70-200/2.8L IS II USM
Previous Firmware updates
Name: Firmware update V1.6 for Canon EF to Micro Four Thirds Speed BoosterS
Release date: 1 Jun 2015
Benefits and improvements
Fixed iris click noise issue while zooming a variable aperture zoom lens. Fixed OM-D E-M1 depth-of-field preview button inoperative issue.
Improved connection reliability if lens is attached to adapter after camera is powered on.
Fixed an intermittent pincushion distortion issue on Panasonic bodies.
Fixed IBIS on OM-D series of Olympus cameras.
Fixed lens hot swapping with passive MFT mount of BMCC.
Name: Firmware update V1.57 for Canon EF to Micro Four Thirds Speed BoosterS