Canon CHDK User Manual page 14

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• Value factor (mm)
[Off, 1, 10, 100, 1000]
Used as a multiplier for Distance bracketing value.
• ISO bracketing value
[0 – 100]
Set this value to bracket via ISO. This value is multiplied by the Value factor below to arrive at
the final ISO value that will be used for bracketing. A value of 2, with a Value factor of 10, will
increase or decrease the ISO by 20 for following exposures.
• Value factor
[Off, 1, 10, 100]
Used as a multiplier for the ISO bracketing value.
• Bracketing type [+/-, –, +]
With all bracketing types the first exposure uses the current exposure settings of the camera. On
following exposures the exposure settings are adjusted as described below.
+ / –
This bracketing type will alternatively apply the bracketing value by first subtracting then
adding. The sequence goes like this...
0 Ev, -1Ev, +1Ev, -2Ev, +2Ev, -3Ev, +3Ev, etc. Bracketing will continue until you release the
shutter. So for example lets say you set the TV bracketing to "2 Ev", and when you half-press
the shutter you notice an exposure time of 1 second. When you fully depress the shutter you will
get exposures at these times: 1 sec, ¼ sec, 4 sec, 1/15 sec, 15 sec, 1/60 sec, 15 sec, 1/250 sec,
15 sec, etc.
–
This bracketing type works as above but will only reduce the exposure value. Using the above
example, the exposure times would be 1 sec, ¼ sec, 1/15 sec, 1/60 sec, 1/250 sec, etc.
+
This bracketing type works as above but will only increase the exposure value. Using the above
example, the exposure times would be 1 sec, 4 sec, 15 sec. Once the camera's limit is reached,
subsequent exposures will occur at the maximum (or minimum) setting.
• Clear Bracket Values on Start Enable [•] / Disable [ ]
Enable this option to turn off bracketing when the camera is turned off.
• Add raw-suffix Enable [•] / Disable [ ]
In bracketing mode you now have the option to add a suffix to the raw filename, so that later you
can easily identify the RAWs that were created during bracketing, it is disabled at default.
Custom Auto ISO
< Extra Photo Operations < Main Menu
This feature has 2 purposes: Allow the user to define the exact ranges of ISO used in
and . As an example: Expand the range from 80-200 to 50-400.
Auto ISO Auto-HI Auto ISO
Give additional information to the camera to allow it to select the optimal shutter speed (to avoid
blur or get the right artistic exposure) and ISO instead of some sub-optimal default...
As an example - Use a faster shutter and higher ISO when shooting sports, but go for a slower