Canon EOS 1D - Manual (Page 64)

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Set the ISO speed (image sensor’s sensitivity to light) to suit the
ambient light level.
1
Press the <Z> button. (9)
2
Set the ISO speed.
While looking at the top LCD panel or
in the viewfinder, turn the <6> dial.
ISO speed can be set within ISO 100-
12800 in 1/3-stop increments.
With “A” selected, the ISO speed will
be set automatically (p.65).
ISO Speed Guide (No flash)
Z : Setting the ISO Speed
ISO Speed Shooting Situation Flash Range
100 - 400 Sunny outdoors
The higher the ISO speed,
the farther the flash range
will be.
400 - 1600 Overcast skies or evening time
1600 - 12800,
H1, H2, H3
Dark indoors or night
If [8C.Fn II -3: Highlight tone priority] is set to [1: Enable], the
settable ISO speed range will be ISO 200 - 12800 (p.215).
Using a high ISO speed or shooting in high-temperature conditions may
result in more grainy images. Long exposures can also cause irregular
colors in the image.
When you shoot at high ISO speeds, noise (horizontal banding, dots of
light, etc.) or irregular colors may appear. Also, if you shoot with the ISO
speed range upper limit expanded to H1, H2 or H3 with [8C.Fn I -3: Set
ISO speed range] (p.208), noise and irregular colors may become more
visible.
With [8C.Fn I -3: Set ISO speed range], the ISO speed range can be
expanded from ISO 50 (L) to ISO 102400 (H3).
COP
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