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227CThe Shooting Menu: Shooting Options
❚❚ Auto ISO Sensitivity control
If Off is chosen for Auto ISO sensitivity control in P, S, A, and M
modes, ISO sensitivity will remain fixed at the value selected by
the user (0 95).
When On is chosen, ISO sensitivity will
automatically be adjusted if optimal exposure can not be
achieved at the value selected by the user.
The maximum value
for auto ISO sensitivity can be selected using the Maximum
sensitivity option in the Auto ISO sensitivity control menu
(choose lower values to prevent noise (randomly-spaced bright
pixels, fog, or lines), but note that if the ISO sensitivity selected
by the user is higher than that chosen for Maximum sensitivity,
the value selected by the user will be used instead; the minimum
value for auto ISO sensitivity is automatically set to ISO 100).
In
modes P and A, sensitivity will only be adjusted if underexposure
would result at the shutter speed selected for Minimum shutter
speed (
1
/
2000–1 s, or Auto; in modes S and M, sensitivity will be
adjusted for optimal exposure at the shutter speed selected by
the user).
If Auto (available only with CPU lenses) is selected, the
camera will choose the minimum shutter speed based on the
focal length of the lens.
Slower shutter speeds will be used only
if optimum exposure can not be achieved at the ISO sensitivity
value selected for Maximum sensitivity.
When On is selected, the viewfinder
shows ISO-AUTO and the information
display ISO-A.
These indicators flash when
sensitivity is altered from the value
selected by the user.