That's what makes your subject look all cool and 3-D. Remember, when you move your flash off camera, the difference in location produces shadows in your image. And it will determine the contrast range in your final, lit picture. This means nothing more than changing my camera's settings to underexpose the ambient. Next, I'll "dial down" my ambient exposure. Once I have that exposure (in which, remember, the shutter speed must be at or below my camera's sync speed) I have a starting point for my final, lit image. I like to find my ambient exposure first-nothing fancy, just trial and error. So you have two exposures to consider in every flash-lit picture: the ambient and the flash. Both are made at once, and both light sources are additive to the exposure. Think of it as two overlaid exposures: Frozen, instantaneous flash exposure, mixed with a slow-shutter-speed ambient exposure. But I also included a flash, which happened instantaneously and froze Robert irregardless of the shutter speed: Army, was made with a slow shutter speed. The shot of Robert, a soldier in the U.S. The photo up top is a good visualization of the fact that two images are being made at once. The flash, being instantaneous, is controlled by the aperture. The ambient exposure is controlled by the f/stop and the shutter speed. Whether you take this into account or not, it is happening every time. You are making an exposure of the ambient light, and an exposure of the flash's light. So just set that aside.Įvery time you take a flash photo, you are making two exposures simultaneously. But (a) they have their drawbacks, and (b) getting into that now would be needlessly complex. Note that there are fancy, flash-pulsing methods which will allow you to sync at higher shutter speeds such as 1/1000th of a second. Which for most cameras is either 1/250th or 1/200th of a second. Since the light from your flash is pretty much instantaneous, it really does not care about the shutter- as long as you are at or below your camera's top "sync" speed. F/stop is a diameter-of-the-lens-hole based control. While f/stop and shutter speed both control exposure, for our purposes it is important to know how they do so differently. Now we are going to start mixing flash and ambient light! so far we have only been using flash as a light source.
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