Canon CHDK Quick Start Manual page 12

10
• Value factor (mm)
in the
FACTOR
"Override Subj. Dist Valu" (OSDV), and also to quickly set the focus distance. When updating
the "
Override Subj. Dist. Valu
amount set in the "
and so forth. In this way the OSDV can be updated faster than trying to change the override from
1 to 450mm by pressing the rocker 449 times.
For cameras without Manual Focus, (IXUS series, and some A series) SD Overrides can be used
to manage focusing, either by entering values in a menu, or by using shortcut keys. In <ALT>
mode, go to Main Menu > Extra Photo Operations > Override Subj. Dist. Valu, > Value Factor -
enter a choice of unit value, either 1, 10, 100, or 1000, this will change the Subj. Dist. Value by
the unit value you entered, ie: if the Value factor is 10, and the Subj. Dist. is 10 then the focus
will be 10 x 10 = 100mm from the lens.
These Manual Focus adjustments can also be achieved with shortcut keys. In <ALT> mode,
using the Left / Right keys to adjust the Value Factor and the Zoom lever to adjust the Subject
Distance, (or on cameras without a zoom lever use the Display button) Infinity is immediately
selected by pressing the Up key, and for Hyperfocal adjustment based on current F-stop and
zoom focal length, press the Down key.
The subject distance values are displayed as part of OVERRIDES on the OSD.
Remember to exit <ALT> mode to shoot pictures with these adjustments applied. Also
remember to uncheck "clear overrides @ start" setting if you want to continue with the current
settings.
Override ISO value
in the
ISO:..
ISO setting. Select the desired ISO setting and the camera will use that setting in all auto and
manual modes.
• Value factor
The factor is used to enable the ISO override, and to set a multiplier against the "Override ISO
value" set above. So if you want to use an ISO of 1200, you would set the "Override ISO value"
to 12, and the "Value factor" to 100. This arrangement exists to speed the setting of a custom
ISO.
See:- OSD Parameters
[Off, 1, 10, 100, 1000]
display in the OSD. The Value factor is used to enable the
OVERRIDES
" with the left/right buttons, the value will be changed by the
." So "1" changes the OSDV by 1mm, "10" changes by 10mm,
Value factor
[0 – {ISO max for camera}]
display in the OSD. This feature allows you to override the camera's
OVERRIDES
[Off, 1, 10, 100]
on Pages 26, and 27 for "Show State Displays" of overrides in the OSD.