Canon EF lenses (see Appendix in the “Instructions” section)
Canon EF-S lenses (some lenses may vignette because the adapter is designed for 1.6x crop, while Sony NEX has a 1.5x crop sensor)
Stabilization, including 5-axis stabilization on Sony Alpha II-series cameras
Electronic manual focus (e.g., Canon EF 85mm f/1.2L II and Canon EF 50mm f/1.0L)
EXIF (focal length, aperture, zoom range)
Shooting modes P, A, S, M
Autofocus (see Appendix in the “Instructions” section)
Display of distance and zoom on VG and FS camcorder series (with lenses that support distance information)
Automatic APS-C mode on full-frame cameras when using Canon EF-S lenses and many third-party lenses
Aberration corrections such as vignetting, distortion, chromatic aberration
Continuous AF
DMF
Eye AF
Attaching another adapter (e.g., some M42 adapters may physically damage a Metabones Smart)
Fast phase-detection AF is supported only on Sony Alpha 7R II. On other Sony cameras, contrast AF with EF lenses can be very slow for most moving subjects and is suitable mainly for static subjects.
Even on Sony Alpha 7R II, autofocus performance degrades significantly with long telephoto zooms as focal length increases.
On Sony Alpha 7R II, central AF points perform well, while edge/corner points may be less effective with fast lenses or telephoto lenses.
During video recording, Sony Alpha 7R II supports contrast AF only, which may result in unsatisfactory AF speed.
During video recording, if the subject moves you must half-press the shutter button to reactivate autofocus and reacquire the subject; due to slow contrast AF, results may be unsatisfactory.
On SONY PXW-FS7, NEX-FS700 and NEX-FS100, autofocus works only in photo mode.
The first two autofocus attempts are used for lens calibration, so the lens may fail to lock; to reacquire, half-press the shutter again.
Autofocus may struggle near the lens’s minimum focusing distance.
Lenses with hidden issues that may not appear on Canon DSLRs can show focusing accuracy issues on Sony NEX. Typical causes include AF mechanism lubrication issues, distance detection errors, etc.
Early Tamron VC lenses such as the 17–50mm f/2.8 B005 may be unable to switch between OIS and IBIS modes.