Introduction to: Aperture, Depth of Field & Shutter Speed
WHAT IS APERTURE?
• The aperture is the size of the lens opening
• It controls the amount of light that is let in:
• A larger aperture lets in more light
• A smaller aperture lets in less light
• The smaller the f/number, the larger the opening
• The larger the f/number, the smaller the opening
f = Sign for aperture
The F word!
IMPORTANCE OF APERTURE
How can it change what your picture looks like?
A larger aperture (lower f/number) will have your
subject in focus, and everything in front of and
behind it blurry.
A smaller aperture (higher f/number) will have your
subject in focus and everything in front of and behind
it quite focused as well.
Also known as Depth of Field
DEPTH OF FIELD
Large aperture = Shallow depth of Field Small aperture = Large depth of Field
• Large depth of field = much of the
image is sharp and in focus.
• Shallow depth of field = only a small
part of the image is sharp and in
There are three things which can change
the depth of field:
1. The aperture
2. The focal length of the lens used
3. How near the subject focussed on is to
• It's how long the sensor/film in the camera is exposed to light
• Shutter Speeds:
½ ¼ 1/8 1/15 1/30 1/60 1/125
• This depends on how much light there is
• If the shutter is open too long, the picture will be too bright, and if it's not
open long enough, the scene will be too dark
Also known as Exposure
= Total amount of light which hits the film
This is controlled by both the aperture & shutter speed
What have we learnt?
• Aperture use = f sign
• Depth of field = focus of the image
• Use of shutter speed = fractions
• Exposure = total amount of light
They all connect!
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