A presentation for Kelso Camera Club

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# A presentation for Kelso Camera Club - PowerPoint PPT Presentation

A presentation for Kelso Camera Club. by Norman Dodds. What is depth of field?. Depth of Field is the amount of a photograph which is in acceptably sharp focus from the foreground to the background. Why is it useful to understand depth of field?.

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Presentation Transcript
What is depth of field?
• Depth of Field is the amount of a photographwhich is in acceptably sharp focus from theforeground to the background
Why is it useful to understand depth of field?
• It allows a photographer to control the amountof the photograph which is in sharp focus toenhancethe effectiveness of the image
What influences depth of field?
• The focal length of your lens:
• wide angle lens = more depth of field
• telephoto = less depth of field
• The distance from the subject:
• further away = more depth of field
• closer = less depth of field
• The aperture of your lens
Aperture
• Aperture is the opening in your lens which lets in lightreflecting from your subject
• Aperture is measured in f stops. Typically lenseswill have apertures from f2 to f36
• Just to confuse, large apertures have small numbersand small apertures have big numbers!
Aperture
• Each aperture allows in half or double the amount of light as you move up or down the f stops
• Your camera may also be able to move up and down the scale in smaller steps with 2 or 3 positions between the ‘official’ f stops
• Aperture has a significant impact on depth of field:
• A large aperture will give a small depth of field
• A small aperture will give a greater depth of field
Why does aperture affect depth of field?
• The explanation is a little bit technical:

The non-technical explanation is simpler - it just DOES!

That works for me!

F 5.6

1/3200

small depth of field

F 11

1/1000

medium depth of field

F 36

1/80

large depth of field

How do you work out what the DoFwill be?
• There are 5 possibilities:
• Ignore it – don’t worry…. be happy!
• Use the depth of field preview if your camera has one.This provides you with a visual check
• Use the depth of field scale if your camera has one
How do you work out what the DoF will be?
• There are 5 possibilities:
• Ignore it – don’t worry…. be happy!
• Use the depth of field preview if your camera has one.This provides you with a visual check
• Use the depth of field scale if your camera has one
• Use a depth of field calculator
How do you work out what the DoFwill be?
• There are 5 possibilities:
• Ignore it – don’t worry…. be happy!
• Use the depth of field preview if your camera has one.This provides you with a visual check
• Use the depth of field scale if your camera has one
• Use a depth of field calculator
• Make an educated guess!
Hyperfocal Distance and Focussing
• The hyperfocal distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp.
• When the lens is focused at this distance, all objects at distances from half of the hyperfocaldistance to infinity will be acceptably sharp.
Hyperfocal Distance and Focussing
• There are three ways to set your focus to the hyperfocal distance:
• Use the scale on your lens – if you have one!
Hyperfocal Distance and Focussing
• There are three ways to set your focus to the hyperfocal distance:
• Use the scale on your lens – if you have one!
• Use a chart

Get this online

Hyperfocal Distance and Focussing
• There are three ways to set your focus to the hyperfocal distance:
• Use the scale on your lens – if you have one!
• Use a chart
• Guess!
Using depth of field
• Set your camera mode to AV - Aperture Value
• If you have a depth of field preview, use that to check the DoF