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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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What is depth of field
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
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
What influences depth of field? recognisable

  • 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 recognisable

  • 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!


Aperture1
Aperture recognisable

  • 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
Why does aperture affect depth of field? recognisable

  • The explanation is a little bit technical:

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

That works for me!


F 5.6 recognisable

1/3200

small depth of field


F 11 recognisable

1/1000

medium depth of field


F 36 recognisable

1/80

large depth of field


How do you work out what the dof will be
How do you work out what the recognisableDoFwill 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 be1
How do you work out what the recognisableDoF 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


Get this online recognisable


How do you work out what the dof will be2
How do you work out what the recognisableDoFwill 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
Hyperfocal recognisable 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 focussing1
Hyperfocal recognisable 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 focussing2
Hyperfocal recognisable 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 focussing3
Hyperfocal recognisable 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
Using depth of field recognisable

  • Set your camera mode to AV - Aperture Value

  • Choose your subject and compose your shot

  • Set your chosen aperture

  • If you have a depth of field preview, use that to check the DoF

  • Check your shutter speed

  • If it’s fast enough – take the picture

  • If it’s too slow:

    • Use a tripod ……. OR

    • Increase the ISO until the shutter speed is acceptable


Shutter speed
Shutter Speed recognisable

  • Shutter speed determines the amount of time the lens remains open when you press the button

  • Similar to aperture, shutter speeds double or halvethe amount of time the lens is open as you clickthrough the different speeds

  • A photograph’s exposure is set by a combination of shutter speed and aperture

  • Shutter speed has no impact on depth of field


Finding out more
Finding out more recognisable

  • Google ‘depth of field’

  • Dofmaster website


Questions
Questions? recognisable


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