Metabones Speed Booster Canon EF to Sony E Mount

• Increase maximum aperture by 1 stop.
• Increase MTF.
• Makes lens 0.71x wider.
• Optics designed by Caldwell Photographic in the USA (patent pending).
• Electronic integration of aperture diaphragm, controlled by or from the camera body.
• Partial autofocus support for late-model (post-2006) Canon-brand lenses.
• Powered by camera body. No external power source required.
• The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads.
• High performance 32-bit processor and efficient switched-mode power supply.

Supported  

• EF lenses
• Image stabilization (IS) lenses
• Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
• EXIF (focal length, aperture, zoom range)
• P, A, S, M exposure modes
• Autofocus (see autofocus support section below)
• Sigma and Tokina lenses in Canon EF mount

A third party zoom lens may need to be registered with the Smart Adapter first in order to detect its maximum aperture. Autofocus is disabled for most third-party lenses.

Not Supported

• EF-S lenses
• DX lenses
• NEX-VG900
• Lens correction such as peripheral shading, CA and distortion
• Focus confirmation "chip" (e.g. Dandelion)
• M42 screw mount adapters (see note 6)
• Stacking non-Metabones mount adapters on top

Autofocus is supported, with the following known limitations.

• Autofocus speed is very slow and inadequate for most moving subjects. The autofocus speed is unfit for professional use for sure, and it would disappoint most enthusiasts.
• Only Canon-branded lenses introduced in or after 2006 are officially supported. Autofocus is disabled for older Canon lenses and most third-party lenses, including most Sigma, Tamron and Tokina lenses and all Contax N lenses modified by Conurus.
• On FS series (e.g. FS700, FS100), autofocus may be available only in photo mode but not in movie capture mode.
• Continuous AF is not supported.
• DMF mode (direct manual focus) is not supported.
• For non-camcorder camera bodies (e.g. NEX-7), during movie capture, if the subject moves to a different distance, half-press the shutter release button to re-activate autofocus and lock onto the subject again. Since autofocus speed is slow, there may be visible disruption in the resulting footage.
• The first two autofocus attempts are used to calibrate the lens and as a result may not lock successfully on the target. Half-press the shutter release button again and autofocus will lock successfully.
• Autofocus may have difficultly locking onto subjects which are very close to the nearest focusing distance of the lens.
• Autofocus accuracy depends heavily on the working condition of the lens. Lenses with hidden problems which may not be apparent on Canon DSLRs will lead to inaccurate and unreliable autofocus on Sony NEX. Typical problems of this kind that we have seen include an unsmooth/erratic autofocus mechanism (e.g. getting stuck intermittently at a certain focusing distance), a worn-out gear train with out-of-spec backlash, a faulty/worn-out distance encoder or other faulty/worn-out internal sensors.

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