Nikon D300 - Manual (Page 121)

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ISO Sensitivity Settings
The settings available depend on the option selected for Custom Setting
b1 ([ISO sensitivity step value], pg. 275).
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HI 0.3–HI 1
The settings [HI 0.3] through [HI 1] correspond to ISO sensitivities 0.3–1 EV
over ISO 3200 (ISO 4000–6400 equivalent). Pictures taken at these
settings are more likely to be subject to noise and color distortion.
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LO 0.3–LO 1
The settings [LO 0.3] through [LO 1] correspond to ISO sensitivities 0.3–
1 EV below ISO 200 (ISO 160–100 equivalent). Use for larger apertures
when lighting is bright. Contrast is slightly lower than normal; in most
cases, ISO sensitivities of ISO 200 or above are recommended.
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See Also
For information on Custom Setting b1 ([ISO sensitivity step value]), see
page 275. For information using the [High ISO NR] option in the shooting
menu to reduce noise at high ISO sensitivities, see page 263.
Custom Setting b1
(ISO sensitivity step value)
ISO sensitivity settings available
1/3 step
(default)
LO 1, LO 0.7, LO 0.3, 200, 250, 320, 400, 500,
640, 800, 1000, 1250, 1600, 2000, 2500,
3200, HI 0.3, HI 0.7, HI 1
1/2 step
LO 1, LO 0.5, 200, 280, 400, 560, 800, 1100,
1600, 2200, 3200, HI 0.5, HI 1
1 step LO 1, 200, 400, 800, 1600, 3200, HI 1
* If possible, the current ISO sensitivity setting is maintained when the
step value is changed. If the current ISO sensitivity setting is not
available at the new step value, ISO sensitivity will be rounded up to the
nearest available setting.