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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

by Norman Dodds

• Depth of Field is the amount of a photographwhich is in acceptably sharp focus from theforeground to the background

• 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? 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 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!

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? 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 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 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 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 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 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 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 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 recognisable

• Set your camera mode to AV - Aperture Value

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

• 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 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 recognisable