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Visible or white light is made up of a range of colours each with a different wavelength. One way to see the different colours is to use a prism to split the light. When white light enters the prism it slows down and changes direction. The amount the light changes depends on the wavelength. Red light changes direction the least and violet the most.

Long depth of fieldphotography

Depth of Field (DoF) refers to the distance between the closest and farthest objects that appears acceptably sharp in a photograph.

Depth of fieldphotography examples

In the case of "stellar" or "annual" aberration, the apparent position of a star to an observer on Earth varies periodically over the course of a year as the ...

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Depth of fieldexamples

These three photographs above are all focused on the same subject (bird feeder) and were taken with the same F stop and shutter speed, the only difference is the distance of the camera from the subject being photographed. The photographer kept walking closer to the subject (bird feeder).

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Long depth of fieldexample

Notice how the size of the leaves in the planter gets much bigger while the size of the round windows on the door remains about the same. The depth seems to increase because the camera was brought closer to the subject.

White light, which enters the prism, is a mixture of different wavelengths, which get bent ( refracted ) by different amounts though the prism, allowing them to be seen separately.

Photography: What, How, Why Copyright © 2023 by Maria Politarhos and Randy Matusow is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

Shallowdepth of field

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Shallowdepth of fieldphotography

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Depth of fieldphotography settings

Notice how the size of the leaves in the bird feeder gets much bigger while the size of the windows directly behind the feeder remains about the same. The depth seems to increase because the camera was brought closer to the subject.

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Just as in the previous example, the closer the subject is to the camera, the shallower the Depth of Field.  These three photographs are all focused on the same subject (planter-box in the middle of the hallway) and were taken with the same F stop and shutter speed, the only difference is the distance of the camera from the subject being photographed. The photographer kept walking closer to the subject (planter box).

Visible light is the part of the electromagnetic spectrum we can see. Each colour has a range of wavelengths. Red has a long wavelength and low frequency and violet has a short wavelength and high frequency.

The larger the opening of the lens (small F Stop number) the less the Depth of Field. Only the person is sharp when using F 1.4 and the background appears blurred/out of focus.

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Long depth of fieldformula

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

When you focus your lens on a subject (the lamp post in our example) the depth of field will change depending on the F stop you are using.

Use the dark card to create a slit over a sheet of white card. Place the card so sunlight shines through giving a thin beam of light.

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When light enters a prism it is refracted. Each colour of the spectrum is refracted by a different amount and the colours are dispersed ( spread out ) allowing you to see them.

The smallest opening (large F stop number) the greater the Depth of Field. The person and the background are sharp when using F 22.