One of the guiding principles of HSW is we teach our participants to “MAKE” photographs, not just take pictures.
Modern cameras have the capability of recording a scene fairly well but you are getting what the camera wants, not what YOU want.
We want you to take back control from the “machine” and use it as your tool to create YOUR vision.
In order to do this you need to have a basic understanding how light interacts with your camera to capture an image.
Obviously, the entire process is about controlling light. We’ll begin by discussing the concept of “exposure.”
Exposure can be defined by a formula that states: Exposure = Illuminance of the image X Time
Before you freak out let’s look at how simple this actually is. Understanding this will really enhance your ability to interpret a scene the way you envision it.
“Time” is easy to understand. It is the length of time the image (light) is allowed to fall on the sensor of your camera and is usually controlled by your shutter.
“Illuminance” just means the amount of light hitting the sensor that is coming from the subject that your camera is pointed at.
There are two factors that can affect illuminance and they are the amount of light actually hitting your subject, (this is call “luminance”), and the surface quality of your subject and how it reflects light. (This is called “reflectance.”)
The amount of light reaching your sensor is also affected by passage through your lens, particularly the aperture.
This can all be distilled down to one sentence that states:
Exposure depends upon subject luminance (illumination and reflection) and camera settings (f/stops, shutter speed and ISO).
We’ll talk about each of these elements separately in upcoming episodes.