<p>The Amount Of Light In The Same Unit <br>
In general, the night scene of the shooting should not use flash, shooting vision, because the distance is too great, the flash simply not serve any purpose. Small aperture and a long exposure, showed a beautiful night view. Shooting portraits at night are generally required to use the flash directly open flash shooting portraits, figures restore normal.<br>
But behind the night scene is very dark, and can not be restored, then you need to use a slow flash function. Slow flash will use longer shutter time to flash to illuminate the subject, and then with the slow shutter to ensure the background is also able to demonstrate.<br>
If your camera has a the slow flash function, can be used directly, If you do not have to set a longer exposure time in manual mode, and can also achieve the same effect.The amount of light in the same unit of time will be the more, and on that level, the amount of light is just the next level doubled, such as aperture adjustment from F8 to F5.6, it more than doubled the amount of light, we also say that the aperture openbig one.<br>
from: <a href="http://www.hotbrandfile.com/The-Amount-Of-Light-In-The-Same-Unit">http://www.hotbrandfile.com/The-Amount-Of-Light-In-The-Same-Unit</a></p
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