C.Fn 2: Flash Sync. Speed in Av Mode The camera adjusts the intensity of the flash based on the scene and will attempt to balance the ambient light of the scene to the power of the flash in any exposure from 1/200 of a second to 30 seconds. In some cases this results in camera shake because the ambient light is dim and the exposure is long.
C.Fn-2:0 Auto. The flash is adjusted to the scene.
C.Fn-2:1 1/200sec. (fixed). The flash will pump out as much power as it needs (up to its useful limit, of course) to achieve a perfect exposure at 1/200 of a second. Camera shake is no longer an issue, but ambient light may not register.
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Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.