That's because my ambient exposure is set to 1/250th at f/8, which is underexposing the non-flash-lit portion of the room by four stops. The problem is, the only thing that is lighting the wall is my flash. So now you look great ( all things considered) but the wall on the other side of the room is way too dark. As my umbrella is very close to you ( yeesh - look at those wrinkles - I can fix that with soft light) we remember that the light is going to fall off very quickly and go pretty dark by the time it gets back to the wall, right? I put my camera at the max synch speed (1/250th) and put my flash on 1/4 power and light you up to f/8. After all, I think we have established that you need all of the lighting help you can get, right? So, I decide to stick an umbrella'd flash up near you and light you that way. You'll still probably look pretty bad - we nailed the quantity, but the quality of the light is likely ugly as it comes from overhead fixtures. So If I shoot you in that light, available only, you are going to be properly exposed. #BALANCING FLASH AND AMBIENT LIGHT ISO#Typical indoor ambient light, for instance, might be about 1/60th at 4/f at ISO 400. In fact, the more you understand it, the more you realize that it is at least as useful as another flash. I mean, it's always there anyway, so why not use it? #BALANCING FLASH AND AMBIENT LIGHT HOW TO#The difference between neanderthal and nuanced is learning how to finesse the ambient portion of your exposure. In fact, even if you are shooting with a disposable point-and-shoot and nuking your drunken frat brother with the flash at about, say, twelve beers into the party, you still have two exposures happening every time you push the button. This is true whether you make use of the second exposure or not. The common thread you should be starting to see is that there are two simultaneous exposures going on every time you use flash. When last we met, we talked about moving from the idea of balancing a nice, even, back-curtain of sunset light to dealing with a highly directional light source (and learning to use it rather than just fill it.) This week, we are taking it indoors to apply the same principles to light that is less directional, less intense and more diffuse.
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