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2. File:Sony a7 II with FE 28mm F2 and fisheye converter - Crop ...

   en.wikipedia.org/wiki/File:Sony_a7_II_with_FE_28...

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3. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   In a circular fisheye lens, the image circle is inscribed in the film or sensor area; in a diagonal ("full-frame") fisheye lens, the image circle is circumscribed around the film or sensor area. This implies that using a fisheye lens for a different format than it was intended for is easy (as opposed to a rectilinear lens), and may change its ...

4. Hemispherical photography - Wikipedia

   en.wikipedia.org/wiki/Hemispherical_photography

   Hemispherical photograph used to study microclimate of winter roosting habitat at the Monarch Butterfly Biosphere Reserve, Mexico.. Hemispherical photography, also known as canopy photography, is a technique to estimate solar radiation and characterize plant canopy geometry using photographs taken looking upward through an extreme wide-angle lens or a fisheye lens (Rich 1990).

5. Chromatic aberration - Wikipedia

   en.wikipedia.org/wiki/Chromatic_aberration

   Chromatic aberration also affects black-and-white photography. Although there are no colors in the photograph, chromatic aberration will blur the image. It can be reduced by using a narrow-band color filter, or by converting a single color channel to black and white. This will, however, require longer exposure (and change the resulting image).

6. Photographic developer - Wikipedia

   en.wikipedia.org/wiki/Photographic_developer

   In the processing of photographic films, plates or papers, the photographic developer (or just developer) is one or more chemicals that convert the latent image to a visible image. Developing agents achieve this conversion by reducing the silver halides , which are pale-colored, into silver metal, which is black when in the form of fine ...

7. Photographic print toning - Wikipedia

   en.wikipedia.org/wiki/Photographic_print_toning

   In a diluted toning solution, selenium toning gives a red-brown tone, while a strong solution gives a purple-brown tone. The change in color depends upon the chemical make-up of the photographic emulsion being toned. Chloro-bromide papers change dramatically, whilst pure bromide papers change little. Fibre-based papers are more responsive to ...