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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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A presentation for Kelso Camera Club

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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 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


Everything in focus


Main subject in focus – background blurred but recognisable


Main subject in focus – background totally blurred


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


Get this online


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

  • 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 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

  • Google ‘depth of field’

  • Dofmaster website


Questions?


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