Electronic

• Viewfinder display of aperture, zoom and distance. (Distance display requires lens which supports distance information.)
• Auto exposure.
• Assignable function button.
• Supports image stabilization (IS) lenses.
• Power is supplied by camera body. No external power source is required.
• Adapter firmware is user-upgradable through the built-in micro USB port.

Optical/mechanical

• Extra-large, geared iris ring. 
• Secure breech-lock for locking the EF/EF-S mount lens solidly.
• Flocking material is coated inside the opening to reduce internal reflection.

• No autofocus.
• Not compatible with Sony F3.

Canon EF Primes

EF 40/2.8 STM
EF 50/1.2 L USM
EF 50/1.8 II
EF 85/1.2 L II USM
EF 100/2.8 USM
EF 135/2L
EF 200/2.8 L II

Canon EF zooms

EF 28-80/3.5-5.6 II 
EF 35-80/4-5.6
EF 70-200/2.8L IS USM II
EF 70-200/4L USM
EF 70-200/4-5.6L IS USM
EF 70-300/4-5.6L IS USM
EF Extender 1.4x III, EF 70-200/4 L USM

Canon EF-S

EF-S 17-35/2.8 IS USM
EF-S 18-55/3.5-5.6 IS II 

Sigma

50/1.4 EX DC HSM
50/1.4 DG HSM
17-35/2.8-4 EX DG HSM
18-35/1.8 DC HSM ART
18-125/3.8-5.6 DC OS HSM

Tamron

SP 17-50/2.8
SP 24-70/2.8
SP 70-200/2.8

Tokina DX

AT-X PRO SD 11-16/2.8 (IF) DX