Metabones Canon EF to Sony E Mount Speed BoosterULTRA 0.71x

Optical/Mechanical

• Increase maximum aperture by 1 stop.
• Increase MTF.
• Makes lens 0.71x wider.
• Felt material flocked inside to reduce internal reflection.

Electronic

• Fast contrast-detection AF on all E-mount cameras (except AF-S/DMF with Sony A9).
• Pure phase-detection autofocus support on A9, A7RII, A7II, A6500 and A6300 (the fastest).
• Supports 5-axis in-body image stabilization of A7II, A7RII and A7SII. (Distance information from lens required; 3-axis IBIS if lens does not transmit distance information.)
• Powered by camera body. No external power source required.
• Efficient switched-mode power supply.
• Supports image stabilization (IS) lenses.
• Supports electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
• EXIF support (focal length, aperture, lens name)
• Distance and zoom display on VG and FS series camcorders, A9, A7 series, A6500 and A6300 (lens with distance information support required).
• Auto magnify (lens with distance information support required)
• Auto "APS-C Size Capture" on full-frame cameras.

Limitations

• Full-frame lens required. EF-S/DX/DC/Di II lenses are NOT supported.
• Speed Booster ULTRA is designed to cover an APS-C image circle which is not big enough to cover a full-size 36mm x 24mm sensor. On a full frame camera body (A7 series, NEX-VG900) the camera needs to have "APS-C/Super 35mm" set to either "Auto" or "On".