Nikon D200 - Manual (Page 44)

Ref
er
enc
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—ISO S
ensitivity
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Noise
The higher the ISO sensitivity, the more likely pictures are to be subject to “noise” in the form
of randomly-spaced, brightly-colored pixels. Pho tos taken at ISO sensitivities over ISO 1600
will likely con tain ap pre cia ble amounts of noise.
High ISO NR ( 131)
This option can be used to reduce noise at ISO sensitivities of 400 or more (this reduces the
capacity of the memory buff er). Note that although high ISO noise reduction is always in
eff ect at ISO sensitivities over ISO 800, turning High ISO NR on will increase the amount of
noise reduction performed.
b1—ISO Auto ( 152)
When On is selected for Custom Setting b1 (ISO Auto), the camera will automatically
vary ISO sensitivity from the value selected by the user to help ensure optimum exposure
(maximum can be selected from ISO 200, 400, 800, and 1600). ISO sensitivity can not be
raised above 1600 while ISO Auto is on, and On can not be selected for ISO Auto at ISO
sensitivities over 1600.
b2—ISO Step Value ( 154)
Depending on the option selected for Custom Setting b2, ISO sensitivity can also be set in
increments equivalent to / or 1 EV.
If possible, the current ISO sensitivity setting is maintained when the step value is changed.
If the current sensitivity setting is not available at the new step value, ISO sensitivity will be
rounded up to the nearest available setting.
ISO step value set to 1/2 step ISO step value set to 1 step