Canon EF lenses

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Canon's EOS (or Rebel) SLRs and DSLRs have the EF lens mount with 44mm flange focal distance. That means a bayonet mount including electric contacts. "EF" means "Electro-Focus". It is not compatible with Canon's FD mount.

The lenses for the EF mount are often called EF lenses. A variant are the EF-S lenses which are designed for Canon DSLRs with APS-size sensor.

Communication protocol[1]

The communication protocol between the camera is 8-data-bit, 1-stop-bit Serial Peripheral Interface Bus (SPI) mode 3. The pins, from right to left on the lens, are:

Canon EF mount pins[2]
Pin Function Notes
VBat +6V to power internal lens focus motors Present on all EOS bodies and lenses
P-Gnd Power ground
VDD +5.5V Digital logic power
DCL Data from camera to the lens (MOSI)
DLC Data from the lens to the camera (MISO)
LCLK Camera body generated clock signal (SCLK, CPOL=1)
D-GND Digital logic ground
COM1 Teleconverter common

Only on most L-series and some macro lenses

EXT0 Short to COM1 for 'Life Size Converter' and x1.4 teleconverter
EXT1 Short to COM1 for x2 and x1.4 teleconverter

The information from the lens is used by the camera body for focusing and metering, and with digital camera bodies it is used to record the lens parameters in the EXIF data in the images.



  • Regular EF
    • EF 14mm f2.8 L USM
    • EF 14mm f2.8 L II USM
    • EF 15mm f2.8 Fisheye
    • EF 20mm f2.8 USM
    • EF 24mm f1.4 L USM
    • EF 24mm f1.4 L II USM
    • EF 24mm f2.8
    • EF 28mm f2.8
    • EF 28mm f1.8 USM
    • EF 35mm f1.4 L USM
    • EF 35mm f2
    • EF 50mm f1 L USM
    • EF 50mm f1.2 L USM
    • EF 50mm f1.4 USM
    • EF 50mm f1.8
    • EF 50mm f1.8 II
    • EF 50mm f2.5 Macro
    • EF 85mm f1.2 L USM
    • EF 85mm f1.2 L II USM
    • EF 85mm f1.8 USM
    • EF 100mm f2 USM
    • EF 100mm f2.8 Macro USM
    • EF 100mm f2.8 L Macro
    • EF 135mm f2 L USM
    • EF 135mm f2.8 Soft Focus
    • EF 180mm f3.5 L Macro USM
    • EF 200mm f1.8 L USM
    • EF 200mm f2 L IS USM
    • EF 200mm f2.8 L USM
    • EF 200mm f2.8 L II USM
    • EF 300mm f2.8 L USM
    • EF 300mm f2.8 L IS
    • EF 300mm f2.8 L IS II
    • EF 300mm f4 L USM
    • EF 300mm f4 L IS
    • EF 400mm f2.8 L USM
    • EF 400mm f2.8 L II USM
    • EF 400mm f2.8 L IS II USM
    • EF 400mm f2.8 L IS USM
    • EF 400mm f4 DO IS USM
    • EF 400mm f5.6 L USM
    • EF 500mm f4 L IS USM
    • EF 500mm f4 L IS II USM
    • EF 500mm f4.5 L USM
    • EF 600mm f4 L USM
    • EF 600mm f4 L IS USM
    • EF 600mm f4 L IS II USM
    • EF 800mm f5.6 L IS USM
    • EF 1200mm f5.6 L USM
  • EF-S lenses for APS-C sensor
    • EF-S 60mm f2.8 Macro USM
  • Tilt/shift lenses
    • TS-E 17mm f4 L
    • TS-E 24mm f3.5 L
    • TS-E 24mm f3.5 L II
    • TS-E 45mm f2.8
    • TS-E 90mm f2.8


  • Regular EF Zoom
    • EF 17-35mm f2.8 L USM
    • EF 17-40mm f4 L USM
    • EF 16-35mm f2.8 L USM
    • EF 16-35mm f2.8 L II USM
    • EF 20-35mm f2.8 L
    • EF 20-35mm f3.5-4.5 USM
    • EF 22-55mm f4-5.6 USM
    • EF 24-70mm f2.8 L USM
    • EF 24-85mm f3.5-4.5 USM
    • EF 24-105mm f4 L IS USM
    • EF 28-70mm f2.8 L USM
    • EF 28-70mm f3.5-4.5
    • EF 28-70mm f3.5-4.5 II
    • EF 28-80mm f2.8-4 L USM
    • EF 28-80mm f3.5-5.6
    • EF 28-80mm f3.5-5.6 USM
    • EF 28-80mm f3.5-5.6 II
    • EF 28-80mm f3.5-5.6 II USM
    • EF 28-80mm f3.5-5.6 III USM
    • EF 28-80mm f3.5-5.6 IV USM
    • EF 28-80mm f3.5-5.6 V USM
    • EF 28-90mm f4-5.6
    • EF 28-90mm f4-5.6 USM
    • EF 28-90mm f4-5.6 II
    • EF 28-90mm f4-5.6 II USM
    • EF 28-90mm f4-5.6 III
    • EF 28-105mm f3.5-4.5 USM
    • EF 28-105mm f3.5-4.5 II USM
    • EF 28-105mm f4-5.6
    • EF 28-105mm f4-5.6 USM
    • EF 28-135mm f3.5-5.6 IS USM
    • EF 28-200mm f3.5-5.6
    • EF 28-200mm f3.5-5.6 USM
    • EF 28-300mm f3.5-5.6 L IS USM
    • EF 35-70mm f3.5-4.5
    • EF 35-70mm f3.5-4.5 A
    • EF 35-80mm f4-5.6
    • EF 35-80mm f4-5.6 II
    • EF 35-80mm f4-5.6 III
    • EF 35-80mm f4-5.6 PZ
    • EF 35-80mm f4-5.6 USM
    • EF 35-105mm f3.5-4.5
    • EF 35-105mm f4.5-5.6
    • EF 35-105mm f4.5-5.6 USM
    • EF 35-135mm f3.5-4.5
    • EF 35-135mm f4-5.6 USM
    • EF 35-350mm f3.5-5.6 L USM
    • EF 38-76mm f4.5-5.6
    • EF 50-200mm f3.5-4.5
    • EF 50-200mm f3.5-4.5 L
    • EF 55-200mm f4.5-5.6 II USM
    • EF 55-200mm f4.5-5.6 USM
    • EF 70-200mm f2.8 L USM
    • EF 70-200mm f2.8 L IS USM
    • EF 70-200mm f2.8L IS II USM
    • EF 70-200mm f4 L USM
    • EF 70-200mm f4 L IS USM
    • EF 70-210mm f3.5-4.5 USM
    • EF 70-210mm f4
    • EF 70-300mm f4-5.6 IS USM
    • EF 70-300mm f4-5.6 L IS USM
    • EF 70-300mm f4.5-5.6 DO IS USM
    • EF 75-300mm f4-5.6
    • EF 75-300mm f4-5.6 USM
    • EF 75-300mm f4-5.6 IS USM
    • EF 75-300mm f4-5.6 II
    • EF 75-300mm f4-5.6 II USM
    • EF 75-300mm f4-5.6 III
    • EF 75-300mm f4-5.6 III USM
    • EF 80-200mm f2.8 L
    • EF 80-200mm f4.5-5.6
    • EF 80-200mm f4.5-5.6 USM
    • EF 80-200mm f4.5-5.6 II
    • EF 90-300mm f4.5-5.6
    • EF 90-300mm f4.5-5.6 USM
    • EF 100mm f2.0 USM
    • EF 100mm f2.8 L IS Macro USM
    • EF 100mm f2.8 Macro
    • EF 100mm f2.8 Macro USM
    • EF 100-200mm f4.5 A
    • EF 100-300mm f4.5-5.6 USM
    • EF 100-300mm f5.6
    • EF 100-300mm f5.6 L
    • EF 100-400mm f4.5-5.6 L IS USM
  • EF-S zooms for APS-C sensor
    • EF-S 10-22mm f3.5-4.5 USM
    • EF-S 15-85/3.5-5.6 IS USM
    • EF-S 17-55mm f2.8 IS USM
    • EF-S 17-85mm f4-5.6 IS USM
    • EF-S 18-55mm f3.5-5.6
    • EF-S 18-55mm f3.5-5.6 USM
    • EF-S 18-55mm f3.5-5.6 IS
    • EF-S 18-55mm f3.5-5.6 II
    • EF-S 18-135mm f3.5-5.6 IS
    • EF-S 18-200mm f3.5-5.6 IS
    • EF-S 55-250mm f4-5.6 IS