Canon EF vs. Fujifilm X-Mount
Comparing 2 standards across 9 specifications. 9 key differences identified.
The Canon EF Mount (introduced in 1987 for the EOS autofocus SLR system) revolutionized photographic camera design as the first 100% all-electronic lens mount, eliminating all mechanical aperture linkages and autofocus drive shafts. Featuring a 44.0 mm Flange Focal Distance and a large 54.0 mm throat diameter, over 150 million EF lenses were manufactured over 33 years.
The Fujifilm X-Mount (introduced in 2012 for the X-Pro1) is a dedicated APS-C mirrorless bayonet mount featuring a 17.7 mm Flange Focal Distance, a 40.7 mm throat diameter, and a 10-pin electronic interface. Designed exclusively for APS-C image circles, it allows compact lens designs optimized for Fujifilm's proprietary X-Trans CMOS sensors.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Flange Focal Distance (FFD)
|
44.00 mm (1.732 in) | 17.70 mm (0.697 in) |
|
Inner Throat Diameter
|
54.00 mm (2.126 in) | 40.70 mm (1.602 in) |
|
Bayonet Tabs
|
3 locking tabs with clockwise twist | 3 locking tabs with counter-clockwise mount twist |
|
Electronic Interface
|
8 gold-plated electronic contacts (expanded to 11 pins on EF super-telephoto lenses for teleconverters) | 10 contact pins (opened to third parties in 2020: Tamron, Sigma, Voigtländer, Viltrox) |
|
Camera Systems
|
Canon EOS-1D X Mark III, EOS 5D Mark IV, EOS 6D II, EOS Rebel series, Cinema EOS C300/C500 | Fujifilm X-T5, X-H2, X-H2S, X-T30 II, X-S20, X-Pro3, X-E4 |
|
Internal Actuators
|
Internal USM (Ultrasonic Motor) in lens body + internal electromagnetic aperture diaphragm (EMD) | — |
|
Variants
|
EF (Full Frame), EF-S (APS-C with rubber bumper back-focus extension), EF-M (discontinued APS-C mirrorless) | — |
|
Back Focus Distance
|
— | Minimum rear optical element clearance of 7.5 mm from sensor |
|
Physical Aperture Rings
|
— | Standard mechanical aperture rings with 1/3-stop clicks on XF lenses |