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The Photo Lab

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In The Photo Lab we take a deeper look into the science, math, and technical aspects of photography

Let's look back at our exposure triangle


shutter speed

  • Controls the amount of time light is hitting the sensor

  • Portrays motion in an image

  • Longer exposures are susceptible to camera shake and blur



  • Controls the diameter of the lens' aperture (hole)

  • Determines the depth of field  (DoF) in an image

  • More DoF needs more light



  • Controls the sensitivity of the sensor

  • Higher ISO, More Sensitive, Brighter Image

  • Light ISO / Clear Image       High ISO / Grainy Image

exposure triangle 2.png

First let's discuss the shutter of a camera.

We already know the shutter controls the amount of time light is hitting the sensor.  But what exactly is a shutter?  A shutter is a device that allows light to pass for a determined period of time, exposing the camera's sensor or film.  There are two main kind of shutters in photography, mechanical shutters and electronic shutters.  Mechanical shutters use a mechanical device that opens and closes to control the amount of light hitting the sensor.  Electronic shutter operates by turning the cameras imaging sensor on and off to control exposure.

These shutters usually gather light one of two different ways. Rolling or Total. 

Rolling shutters 

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