Camera Parts: ISO Setting Knob
One of the most important factors of a properly exposed image on a digital camera is the ISO setting. ISO is digital photography's equivalent to film speed. This setting determines how much light will be needed to expose the image. On a typical camera, the ISO speeds offered are 100, 200, 400 and 800. Some cameras also have settings of 1600 and 3200.
Unlike film, higher numbered settings require less light for exposure. However, when the setting is high, the camera is very sensitive to interference noise which can cause the images to come out looking grainy. For sharp, clear pictures, you should avoid shooting with a high ISO setting and only raise it in low light situations.
Changing the ISO Setting
Changing the ISO setting on your camera is easy. If you have an SLR camera, then it most likely has a button devoted to the ISO. To change the setting, just click on the button and then use the main dial to adjust the settings. You can also set the ISO to auto in order to let the camera pick the best speed. Changing the ISO setting on your point and shoot camera might be a little more difficult. The majority of them require you to navigate through the menu to find the option to change the setting.