Most scenes that you photograph have an overall brightness of middle gray.
When automatic exposure works well...read about it and learn more for better photographs!
Not all scenes average out to middle grey. Let's take a look at some of the most common situations where your automatic exposure system will have problems and you'll need to override the suggested exposure settings.
Most digital cameras provide ways to override the automatic exposure system to get the exposure you want. The most common choices are exposure compensation, exposure lock, or autoexposure bracketing.
Every flash has a maximum useful range. The intensity of the flash when it reaches a subject depends on the flash's power and on how far the light has to travel...
Read on and learn more!