Camera Flash Modes
Auto Flash Mode
The Auto Flash Mode option automatically fires the flash whenever the light level is low for a good exposure or when the main subject is back lit. This setting is the best choice for most shooting circumstances.
Flash On with Red Eye Reduction Mode
There is also a downside to using a red-eye reduction mode - many subjects blink during the pre-flash, and then the second flash catches them blinking. Or sometimes subjects think that the first flash means the photo was taken and they move and the second flash fires to capture their movement on the photo.
To successfully eliminate red eye, you need an external flash that is positioned away from the axis of the camera lens. If however you do not have an external flash but only a built-in flash, the best strategies are to zoom the lens out to a wider angle, tell the subject to look directly at the camera, try to get close, or increase the overall room lighting.
On most cameras you have the option to turn red-eye reduction mode off.
The Red-Eye Reduction mode is useful when shooting portrait images but in many other situations you might want to turn it off as it does introduce a very brief delay between pressing the shutter button and capturing the image because the red-eye reduction light needs time to flash.
Flash Off Mode
This camera flash mode turns the flash off so that it will not fire even if the light is low. You can instead use a long exposure to capture the image in natural light
Fill-in Flash Mode
You will select this camera flash mode when you want to filling in shadows when photographing in bright sunlight or when your subject is back or side lit. In such situations shadow areas can be so dark in the image that they show little or no detail. And when the subject is back lit or against a bright background, it can be underexposed.
Fill flash is also a good way to get accurate color balance under unusual lighting.
Using the fill-in camera flash mode is also very useful when photographing room interiors, which may include a window and where the existing light alone leaves heavy black shadows. If possible, use a powerful flashgun in these circumstances and bounce the light off a suitable wall or surface not included in the picture. This will produce the most even fill-in effect for the scene.
Slow Shutter Flash Mode
This camera flash mode works by firing a short burst of flash during a longer exposure to freeze objects while still allowing them to blur. If you want to avoid the blur, you will need to use a tripod or use this effect creatively.
This mode is best used for night portraits where the flash lights up the person and the long shutter is used to record the night or city lights.
Slow Shutter Flash Mode
This camera flash mode is often used in sports photography for motion studies of a moving subject i.e. golf swing.
High-Speed Sync Flash Mode
The only drawback is that the feature minimizes the effective flash range so you can't be positioned as far from a subject. The higher the shutter speed you use, the closer you have to be.
Controlling Flash Exposure
Flash Exposure Compensation
This is an ideal way to balance flash and natural light when using fill flash and to correctly expose scenes or subjects that are darker or lighter than normal. It can give excellent results as it allows you to make more details visible in the shadows, while minimizing the "flatness" that can occur when full flash is used and all the shadows are removed.
The exposure compensation function often lets you vary flash exposures plus or minus 2 stops in one-third stop increments.
Flash Exposure Bracketing
Flash Exposure Lock
The feature works by firing a preflash that is used by the light metering system to calculate correct exposure for the primary subject area and the resulting flash settings are locked in. You can then recompose the scene or make exposure or focus adjustments without losing your flash exposure data.
Flash Exposure lock feature is extremely useful when the main subject is off-center or there is a strong back lighting.