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Single Lens Reflex (SLR)

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...This medium-format (6x7cm) camera is not fitted with a prism, instead it features a viewing hood with magnifier. An instant return mirror is a convenience. Despite this, the only thing you do not see through an SLR is the precise moment...

Ultraviolet (UV) Filter

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

Search for publications

The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...A glass or plastic filter that fits over a lens to filter out ultraviolet light. Although they have some small effect on haze at altitude, UV filters are more commonly fitted as lens protectors because they have no effect on light...

Spherical Aberration

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

Search for publications

The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...Spherical aberration is a lens fault that occurs when rays that are close to the centre of the lens (its optical axis) focus further away than those that strike the outer zones of the lens, which are bent more. This results in a soft...

Adams, Ansel

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...Adams was born in San Francisco, in 1902. His childhood love of nature never left him, although his career was originally marked out as a pianist. Photography gave a much needed structure and discipline to his life and he enjoyed success...

Additive Colour

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...White light passing through a prism creates all the colours of the rainbow but only three colours are necessary to make up all the others. These are called the additive primary colours (red, green and blue). Equal quantities of red, green...

Aerial Perspective

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...Mist and fog emphasise the effect, as seen in this image of a temperature inversion in the English Lake District.Aerial perspective is where the distant view is seen as lighter toned through the depths of the atmosphere, while foreground...

Alternative Processes

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...The major photographic processes are the common film and digital imaging methods in use today – colour negative and reversal, black-and-white film and digital photography – many involving imaging based on silver halide chemistry....

Colour Filter Array

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...Tri-linear array with strips of red, blue and green sensors.Bayer pattern mosaic with twice as many green photo sites as red or blue.Three-layer structure of the Foveon image sensor.The process by which a digital image is created is known...

Artefacts

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

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The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...Artefacts are unwanted effects created by some photographic processes. Compression and sharpening may produce artefacts. Sharpening is achieved by increasing local edge contrast. Carry this too far and a ghost black line will appear on one...

Aspect Ratio

David Präkel

David Präkel has enjoyed a successful and diverse career in journalism, photography and education. He has taught photography at all levels in the UK and America, at the prestigious Kodak Imaging Training Centre and in his own training workshops in Northumberland. Author affiliation details are correct at time of print publication.

Search for publications

The Visual Dictionary of Photography

AVA Publishing SA, 2010

Book chapter

...The aspect ratio of an image is its width divided by its height. This is usually given as two whole numbers. The 35mm film frame is 36mm wide and 24mm high and therefore has an aspect ratio of 3:2.The aspect ratio of many compact digital...