Custom Functions

Option
Values
01: SET button function * 0: Default (no function)
1: Change quality
2: Change Picture Style
3: Menu display
4: Image replay
02: Long exposure noise reduction 0: Off
1: On
03: Flash sync speed in Av mode * 0: Automatic (slow sync)
1: Fixed at 1/200 sec (when using flash)
04: Shutter button / AE lock button 0: Shutter half-press: AE, AF. <*>: AE lock
1: <*>: AE, AF. Shutter half-press: AE lock
2: Shutter half-press: AE, AF. <*>: AF lock (no AE lock)
3: <*>: AE, AF (no AE lock). Shutter half-press: AE
05: AF-assist beam / Flash firing * 0: Emits
1: Does not emit
06: Exposure level increments 0: 1/2 stop increments
1: 1/3 stop increments
07: Flash firing *

0: Fires
1: Does not fire

08: ISO expansion 0: Off
1: On (enables ISO 50 & 3200)
09: Bracket sequence / auto cancel

0: 0, -, + / Enable
1: 0, -, + / Disable
2: -, 0, + / Enable
3: -, 0, + / Disable

10: Superimposed display 0: On (highlight AF points on focusing screen)
1: Off
11: Menu button return position 0: Previous (top if camera is powered off)
1: Previous
2: Top
12: Mirror lockup ** 0: Disable (normal)
1: Enable (first press of shutter release flips mirror up, second press takes exposure - reduces vibration)
13: AF point selection method * 0: Normal
1: Multi-controller direct
2: Quick control dial direct
14: E-TTL II * 0: Evaluative
1: Average
15: Shutter curtain sync 0: 1st curtain sync (flash fires after shutter opens)
1: 2nd curtain sync (flash fires before shutter closes)
16: Safety shift in Av or Tv 0: Disabled
1: Enabled
17: AF point activation area * 0: Standard
1: Expanded
18: LCD display->Return to shoot. * 0: With Shutter Button only
1: Also with * etc.
19: Lens AF stop button function 0: AF stop
1: AF start
2: AE lock while metering
3: AF point:M -> Auto/Auto -> ctr.
4: One Shot <> AI Servo
5: IS start
20: Add original decision data 0: Off
1: On
00: Focusing Screen 0: Ee-A
1: Ee-D
2: Ee-S

* New or changed compared to the EOS 20D

** In my opinion (and that of other photographers) there is no logical reason for mirror lockup to be hidden away in the custom function menu, instead it should be a selectable drive mode like self-timer.