Canon RF vs. Sony E-Mount
Comparing 2 standards across 9 specifications. 9 key differences identified.
The Canon RF Mount (introduced in 2018 for the EOS R system) is a 3-tab full-frame mirrorless bayonet mount featuring a 20.0 mm Flange Focal Distance, a wide 54.0 mm inner throat diameter, and an advanced 12-pin high-speed data bus. Retaining the large 54mm diameter of the classical EF mount, it enables ultra-fast aperture lenses such as the RF 28-70mm f/2L and 50mm f/1.2L.
The Sony E-Mount (introduced in 2010 for NEX mirrorless and expanded in 2013 to 35mm full frame as FE) is a 3-tab bayonet lens mount featuring a 18.0 mm Flange Focal Distance (FFD), a 46.1 mm throat diameter, and a 10-pin high-speed electronic interface. It is the most widely adopted open third-party full-frame mirrorless mount in the photographic industry.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Flange Focal Distance (FFD)
|
20.00 mm (0.787 in) | 18.00 mm (0.709 in — distance from lens mount mating surface to sensor plane) |
|
Inner Throat Diameter
|
54.00 mm (2.126 in — identical to legacy Canon EF mount) | 46.1 mm (1.815 in) |
|
Bayonet Tabs
|
3 asymmetrical stainless steel bayonet tabs with clockwise mounting twist | 3 asymmetrical locking tabs with clockwise twist lock |
|
Electronic Interface
|
12 contact pins (high-bandwidth bidirectional bus for lens control ring and Coordinated IS up to 8 stops) | 10 gold-plated leaf contact pins (supports real-time eye-AF tracking, OSS, active lens breathing compensation) |
|
Camera Systems
|
Canon EOS R5 / R6 / R3 / R8 / R, Cinema EOS C70 / C80 / C400, APS-C EOS R7 / R10 | Sony A7 / A9 / A1 series, FX3 / FX6 cinema lines, A6000-series APS-C bodies |
|
Legacy Adaptability
|
100% native AF/IS compatibility with all Canon EF/EF-S lenses via Canon EF-EOS R adapter (24mm spacer) | — |
|
Lens Control Ring
|
Physical programmable control ring on all native RF lenses (aperture, ISO, exposure compensation) | — |
|
Full-Frame vs APS-C
|
— | FE lenses cover 36×24 mm full frame; E lenses cover APS-C (auto-crops on full-frame bodies) |
|
Third-Party Protocol License
|
— | Open disclosure to lens manufacturers (Sigma, Tamron, Zeiss, Samyang, Voigtländer) |