Canon CHDK Quick Start Manual page 15

Example: Camera set ISO 100 at 1/8s. AutoISO configured to ISO50-400 at
1/15s:
AutoISO
This feature is available in all modes except for Shutter priority (Tv). It is also
disabled in stitch assist to prevent using different settings for each panorama part.
Enable Custom Auto ISO
•
This is the master switch for this feature.
• Minimal Shutter Speed
Here you have basically two options:
1. - This is for use when photographing still-life,
Auto
landscapes, etc. It will use the factors below to prevent
camera shake, but will assume the subject holds still.
2.
Numerical setting
you are photographing.
The camera will try to use this value or a faster one as much as possible (to prevent blur),
e.g.
1/8s - 1/30s
1/60s - 1/125s
1/250s - 1/1000s
• User Factor
This setting accounts for the user's ability to hold the camera steady. It is based on the old rule
that your shutter speed should be no less than 1/focal-length. Start by dividing the effective focal
length of the lens by the actual focal length. The answer is generally somewhere around 6. Then
increase or reduce this amount by a self-assessed value of your steadiness. If you think your
hands are steadier than average then decrease by 20%. If you think you're shaky then increase
by 20%.
• IS Factor
In determining the ISO setting, the effectiveness of the IS system will be taken into account.
Use a setting of 4 if your IS is effective enough to give you a two-stop reduction in shutter
speed. Use a setting of 2 if the IS isn't very effective, or 8 if the IS is very effective.
• Max ISO HI
Sets the maximum "HI" ISO that the camera can select.
• Max ISO Auto
Sets the maximum "Auto" ISO that the camera can select.
• Min ISO (x10)
Sets the minimum "Auto" ISO that the camera can select.
Clear override values@start
Extra Photo Operations overrides will be cleared for the next time the camera is started.
will shift to ISO200 to maintain 1/15s shutter speed.
[Auto 1/8 -etc]
- hint to the camera what the optimal shutter speed is for the subject
- Slow moving subjects.
- Kids, Pets, general movement
- Sports, Fast action
(1/FL/factor)
(Tv*factor)
(x10)
(x10)
Enable [•] / Disable [ ]
Enable [•] / Disable [ ]
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