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| p.1 #3 · ?? about flip down wide flash adaptor on speedlight |
The amount of light coming out of the flash remains the same .... the distribution and corresponding angles/distances of where you are bouncing your photons will be the variable. How thinly you spread your photons will be dependent upon the area of coverage you are distributing across.
Consider a "pat" of butter spread across a cracker vs. a piece of bread. The cracker will have a "richer" taste to it as the butter is more concentrated to a localized area, while the thinner spread of butter across the bread will have a "thinner" flavoring to it.
Now, use TWO pats of butter to spread across your bread and you can achieve a "richer" flavoring than that of just one pat ... but TWO pats onto a cracker might be a bit too "tasty" for some palletes.
It is essentially an issue of output volume (one pat or two) vs. area of distribution (cracker or bread) to achieve a concentration level at the subject (rich/contrasty or thin/flat). How "tasty" you want your subject to be is up to you. Are you spreading all of your light onto your subject, or is some of it being slathered wastefully (as in a spill) onto the counter (around the room).
Some of the realized light loss is due to the absorption of energy by the fabric, but much of the variance at how much energy is reaching your subject (and reflecting to the camera) is due to how "thin" you are spreading your light (redistribution angles/distance) ... and of course, what angles are involved for shadow placement.
BTW, props to whoever first told me @ butter years ago.