Nikon D200 D200 User's Manual - Page 44

Reference-ISO Sensitivity 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. Photos taken at ISO sensitivities over ISO 1600 will likely contain appreciable 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 buffer). Note that although high ISO noise reduction is always in effect 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. ISO step value set to 1/2 step ISO step value set to 1 step 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. 34