In daily shot of the Digital Camera Battery time often will have insufficient light, no matter how to adjust the other parameters can't solve the problem. This time we need flash to fill light.

Flash synchronous flash to turn off the lights when is the use of a key problem, because flash sync directly determine the we use flash shutter speed.

Synchronous shutter, general flash need to be in the canon nb-2l battery fully open and then curtain shade before not follow up when the flash, such ability make photosensitive element completely exposed. If we will shutter speed was accelerated. So the shade of follow up after speed will change soon. When the shutter speed to a certain value, to make the shade of clearance before and after less than the piece of photographic components, also is the front area is open, trigger flash light, but has begun to follow up after curtain, make photosensitive components was partly blocked after shade, can't light-sensitive.

Use a flash when the shutter speed have a cap, otherwise it will cause local picture can't photosensitive phenomenon. This shutter value of the Canon EOS 1100D Battery upper limit of we call it synchronous shutter. Common synchronization shutter value generally have 1/125 SEC, 1/250 SEC, 1/500 SEC. So when the shooting should choose the speed under synchronous shutter.




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