ISO Sensitivity Settings(User’s Manual: D300S page 96; D300 page 96)ISO sensitivity settings are provided to give you control overthe light sensitivity of the imaging sensor, including whetheryou manually control it or the camera sets it automatically.An ISO sensitivity number, such as 200 or 3200, is anagreed-upon sensitivity for the image-capturing sensor.Virtually everywhere one goes in the world, all camera ISOnumbers will mean the same thing. With that fact beingestablished, camera bodies and lenses can be designed to takeadvantage of the ISO sensitivity ranges they will have to dealwith. Standards are good!In the D300(S), the ISO numbers are sensitivity equivalents.To make it very simple, ISO sensitivity is the digitalequivalent of film speed. The higher the ISO sensitivity, theless light needed for the exposure. A high ISO setting allowshigher shutter speeds and smaller apertures.In Figure 3-48 we see the external camera controls used tochange the ISO sensitivity on the D300(S).209
