Aperture shutter speed and iso.
The light triangle photography.
Shutter speed the amount of time that the shutter is open.
For example moving from a shutter speed of 1 60 s to 1 30 s will add a stop of light because the shutter will remain open twice as long.
Aperture the size of the opening in the lens when a picture is taken.
To double the amount of light we need to double the length of the exposure.
This exposure triangle concept refers to how large or small the opening is thru the lens as you can see in the above illustration.
The exposure triangle is a common way of associating the three variables that determine the exposure of a photograph.
Shutter speed is probably the easiest of the exposure triangle sides to understand.
Each of the three aspects of the triangle relate to light and how it enters and interacts with the camera.
This opening is what controls how much or little light can pass through the camera lens and onto the camera s sensor.
Hopefully this post has helped explain the exposure triangle photography concept in some detail.
Don t worry this isn t a geometry lesson.
The depth of field is a byproduct of this concept.
The key part is controlling the amount of light and focusing the light so we get a correctly exposed and in focus image.
Iso the measure of a digital camera sensor s sensitivity to light.
Aperture shutter speed and iso.
The three elements are.
Light passes through a hole and is captured on a medium.