Last time we looked at Aperture Priority Mode and how depth of
field can help you be more creative with your photography. With
Aperture Priority mode the camera chooses the shutter speed for
the shot. (image: Fireworks at Disney by Express Monorail) So
this time we’re going to look at what happens when you flip it
around and use Shutter Priority Mode (TV), and have full control
over the shutter and let the camera choose the aperture. What’s
a Shutter? The shutter in this case is the opening in the camera
body that lets light through to the image sensor. But more
importantly you can control how long the light gets to go
through to the image sensor, or how long the image sensor is
‘exposed’ to the light. That’s why it’s called exposure! As
opposed to the aperture opening we talked about last time, where
the aperture controls the amount of light coming into the camera
through different sized holes or ‘apertures’ in the lens. The
shutter controls how long that light then gets to pass through
onto the image sensor