The Canon EF Lens to Micro Four Thirds Speed Booster (MB_SPEF-m43-BM1) is not compatible with Olympus E-M10, E-M1, E-M5 . Olympus E-M10, E-M1, E-M5 users please choose another version called "Canon EF Lens to Micro Four Thirds Speed Booster S Version (MB_SPEF-m43-BM2)". S version must use with active MFT mount carmeas, such as OMD, GH4 and BMPCC, but not for passive MFT mount cameras e.g. BMCC 2.5K.
ncrease maximum aperture by 1 stop.
Makes lens 0.71x wider.
Build-in electronics to control lens aperture.
The lens aperture is set by the controls on the camera body.
Powered by camera body. no external power source required. (also accept 3rd party external power supply via MicroUSB socket when using with passive MFT mount camera e.g. BMCC 2.5K)
High performance 32-bit processor and efficient switched-mode power supply.
The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.
Type of Accessory Macro Ring Overview The PROMASTER Macro Ring P is used to mount...
The tripod foot is Detachable and compatible with Arca Swiss, Markins, Photo cam ball...
Increase maximum aperture by 1 stop. Increase MTF. Makes lens 0.71x wider. Optics designed...
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