[RobAmy]

Michelle, you mention you have to learn mirror lock up. Its very easy, go into your menu and you can set it to on. ( it would be great for a external button for this)

Custom Functions for the 20d

01 0 - The set button (in the middle of the back dial) does nothing when shooting
02 1 - Turns on noise reduction for long exposures
03 1 - Locks 1/250 sync in Av mode
04 1 - Set focus to back button (use 0 if you prefer to focus with the shutter)
05 2 - Only fire AF assist light when using external flash
06 0 - 1/3 stop exposure increments
07 0 - Affects built-in flash when in program mode
08 0 - Turns off ISO expansion (3200)
09 0 - Auto bracketing sequence
10 0 - Focus point lights up in viewfinder
11 1 - When hitting menu button, it defaults to the previous selected menu item. We suggest leaving this on FORMAT so you can reformat quickly every time you put a new card in the camera
12 0 - Setting this to 1 locks up the mirror
13 1 - Allows focus point selection using the multi-selector (the little joystick on the back)
14 0 - E-TTL II flash mode
15 0 - 1st curtain flash sync
16 0 - Disables safety shift in Av or Tv mode
17 0 - Sets black button on front of long lenses to AF stop
18 0 - Used only for data verification kit


Setting # 12 to 1 will lock up the mirror