Canon CHDK User's Guide download pdf (Page 15)

shutter and minimal ISO when shooting still landscapes) Method - The camera will try to

maintain lowest ISO as long as shutter speed is no-slower than user deﬁned (more below).

Custom Auto ISO will kick-in whenever ISO HI/Auto ISO is chosen. This allows a quick

manual override by choosing a speciﬁc ISO value.

! Example: Camera set ISO 100 at 1/8s. Auto ISO conﬁgured to ISO50-400 at

! 1/15s: Auto ISO will shift to ISO200 to maintain 1/15s shutter speed.

! 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 Enable [•] / Disable [ ]

! This is the master switch for this feature.!

•

Minimal Shutter Speed [Auto 1/8 -etc]

! Here you have basically two options:

! 1) Auto - This is for use when photographing still-life,

! landscapes, etc. It will use the factors below to prevent

! camera shake, but will assume the subject holds still.

2) Numerical setting - hint to the camera what the optimal

! shutter speed is for the subject 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 - Slow moving subjects.

! 1/60s - 1/125s - Kids, Pets, general movement

! 1/250s - 1/1000s - Sports, Fast action

•

User Factor (1/FL/factor)

This setting accounts for the user’s ability to hold the camera steady. It is based on the old

rule that the 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 (Tv*factor)

In determining the ISO setting, the effectiveness of the IS system will be taken into account.

Use a setting of 4 if the 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 (x10)

Sets the maximum “HI” ISO that the camera can select.

•

Max ISO Auto (x10)

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 Enable [•] / Disable [ ]

Extra Photo Operations overrides will be cleared for the next time the camera is started.

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Canon CHDK User's Guide Page 15

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