First up, the size of the light source in relation to the size of the subject.
Imagine looking out the window at the front yard and without seeing the sky knowing whether it is sunny or cloudy. We do know, right?
We don’t have to see the sky to know if it is sunny or cloudy, we can tell from the way the light is behaving on the subjects in our yard. The car has a deep shadow below it if it is sunny and very little shadow at all if it is cloudy.
The plants are either casting long shadows or seemingly no shadows. The sun makes everything have a shadow, while the cloud cover acts as a shadow reliever.
We know this because we have observed the world for our whole lives and we understand how light works when it is sunny and when it is cloudy.
The sun is a tiny light source. (Yes, science nerds it is way huge, but I am talking about from where we look at it.) No more than a coin in the sky.
That is a very small light source. And it can be totally blocked out by the smallest of items: a branch, or a rose, or even a butterfly. That means that the light cannot go around the subject and is instead blocked by the subject.
Here is the equivalent of the sun in the studio. A small, unmodified light at a distance from a coffee cup.
And here is how the shadow falls on a small coffee cup when a very large light is applied. The light wraps around the coffee cup because the light is so much larger than the subject.
That is how the sun works as well.
The sun is the very small light source, and when the clouds come over the land, the sun lights the back of the clouds and they light the earth with no shadows because they go from horizon to horizon. Light is wrapping all around all the subjects it is seen by.
Think of your softbox as a “cloud cover” for your light (the sun) and it makes more sense to you.
Question: is a 4’x5′ softbox a large softbox or a small softbox?
The answer is compared to what? Other softboxes? Yes.
The subject? Well – that depends. What is the subject?
If the subject is a Hot Air Popcorn Maker, then it is indeed a very large light source.
If our subject is a jetliner, then no – it is not a very big light source at all.
And then… how far will it be from our subject?
Distance makes the perceptual size of the light source diminish as it gets farther away. And it is that perceptual view is the one that matters.
A 20″ light source very close to a 1″ watch is a large light source. A 72″ x 72″ source far away from a 14′ square box is a small light source.
And the light will render that way as well.
LIGHT DOES THE SAME THING EVERY TIME – IT IS THE SUBJECTS THAT CHANGE THE GAME
ASSIGNMENT FOR THIS CLASS:
- Choose a subject less than about 8″ – like a shoe or a water bottle. Light it with a small light source (speedlight) to see how the shadows fall. Then light it with a softbox (24″ or so) in close. Very close.
- Move the softbox 6″ away and take another shot. Then do it again at 6″ intervals until the softbox is 6 feet away. Notice the changes in how the subject responds to the light, and how the shadows get sharper and deeper.
The size of the light source in relationship to the subject is one of the four principles of light.
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