C.Fn-0

Calibrates exposure meter to match characteristics of focusing screen.

C.Fn-1

Sets auto film rewind mode.

C.Fn-2

Sets film leader position after rewind.

C.Fn-3

Sets film sensitivity.

C.Fn-4

Lets AE lock button activate/deactivate AF.

C.Fn-5

Swaps functions of electronic dials and allows aperture setting without lens.

C.Fn-6

Changes increments for user-selected shutter speeds, apertures, exposure compensation and flash exposure compensation.

C.Fn-7

Enables/disables USM lens electronic ring MF.

C.Fn-8

Sets frame counter display mode.

C.Fn-9

Sets options for AEB sequence and auto cancellation.

C.Fn-10

Sets AF superimposition options.

C.Fn-11

Determines focusing point selection method.

C.Fn-12

Enables/disables mirror lockup.

C.Fn-13

Limits focusing points and links spot metering.

C.Fn-14

Enables/disables automatic reduction of fill-in flash output.

C.Fn-15

Selects shutter curtain synchronization timing.

C.Fn-16

Enables/disables safety shift in Tv/Av priority AE.

C.Fn-17

Expands manual focusing point selection range.

C.Fn-18

Determines method of preselected focusing point recall.

C.Fn-19

Reassigns AF stop button on lenses to other functions.