• Suitable for EF lenses
• Image stabilization (IS)
• 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)
• Distance and zoom display on VG and FS series camcorders (see note 1)
• Auto magnify (see note 1)
• Contax N mount lenses modified to Canon EF by Conurus (see note 2)
• Contax 645 NAM-1 adapter modified to Canon EF by Conurus (see note 2)
• Sigma, Tamron and Tokina lenses in Canon EF mount (see note 3)
• Manual focus lenses adapted to Canon EF mount ('chipped' or 'AF confirm' adapters are not supported)

Note:

• Requires lenses supporting distance information.
• Autofocus disabled for Contax N and Contax 645 lenses.
• 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.
• This Speed Booster™ is designed to cover an APS-C image circle which is not big enough to cover a full-size 36mm x 24mm sensor.
• Sony NEX cameras cannot display aperture values beyond f/1.0. If a f/1.2 Canon EF lens is used with the Speed Booster™, the resulting aperture is f/0.9 but the camera body displays f/1.0.