| Fn | Rec | Notes |
| Off | Off | Nothing happens when button is pressed. |
| LCD Backlight on/off | LCD Backlight on/off | Toggles
the backlight on/off, may be of use in theatres to limit annoyance to
others. It is disabled when the VF-2/3 is mounted - LCD or VF always on. |
| Record video start/stop | Record video start/stop | Press
to start video and press again to stop. One still image can be taken
during a video (that was started with the Rec button) by pressing the
shutter, but it breaks the video into two files. |
| AEL/AFL | AEL/AFL | Toggles
exposure lock or initiates AF if Mode is set appropriately. Quite
complex possibilities here. Use the Mode settings found in Custom Menu
B - AEL/AFL to set up desired camera operation and also desired
Fn/Rec button operation. |
| Underwater 1 & 2 | Underwater 1 & 2 | Use in underwater housing to toggle between near and far. Not explained at all in manual. |
| My Mode | My Mode | Need to hold button down while shooting to invoke the selected MyMode. |
| Test picture, no save | Test picture, no save | Need to hold while shooting, the image only appears on review and it is clearly labelled "Test". The image is not saved to card. |
| RAW + jpeg | RAW + jpeg | If camera set to jpeg only, then this button setting will toggle between RAW+jpeg and jpeg only modes. |
| Manual Focus | Manual Focus | Toggles between Manual Focus and the AF mode that has been set. |
| Focus home position | Focus home position | Sets
the optional 10x or 14x focus box to its current position so that it
will reappear there at next turn on and magnify is pressed to get from
the default 7x box to the smaller box. |
| One Touch White Balance | One Touch White Balance | Hold
down button, aim at white or neutral grey paper and fill the screen,
press shutter. Mode now set to your custom white balance. Use SCP to
get back to Auto WB or whatever was needed later. |
| DOF Preview | DOF Preview | Holding
button puts aperture at selected setting, this is the only way to see
the effect of the chosen aperture before taking the shot. Otherwise the
aperture keeps changing randomly to suit light conditions during
preview. |
| Face Detect | Face Detect | Toggles
face detect on and off. When on also causes some other image
improvements to occur to help obtain a more successful image. |