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(User’s Manual: D300S page 160; D300 pages 156)
The Manage Picture Control section of your camera’s Shooting Menu is designed to allow you to create and store Custom Picture Control settings for future use. If you modify them under the Set Picture Control section just before this one, you simply create a one-offsetting. If you’d like to go further and create your own named Custom Picture Controls, the D300(S) is happy to oblige.