Diffraction Scattering of light caused by deflection at the edges of an opaque object. Diffraction causes slight fuzziness in the image when the narrowest apertures are used. Sources: Pixabay, NASA,Wikipedia, Susan Wingfield…
Differential focusing Controlling depth of field to ensure that one element in the picture is sharp, while others are as out of focus as possible. Sources: Pixabay, NASA,Wikipedia, Susan Wingfield…
Depth of field A measure of how much of a picture is in focus, from the nearest point in the scene to the camera that looks sharp, to the furthermost point that…
Dedicated flashgun A type of flashgun that’s designed to provide direct one-way or two-way communication with the camera. The amount of dedication varies enormously depending on the flashgun and camera. Increased dedication tends…
Decisive moment The split-second when all the elements of a photograph simultaneously come together. The decisive moment is associated with Cartier-Bresson, who described photography as “the simultaneous recognition, in a fraction of a second,…
The ABC of Photography - J J Jack A socket into which a plug is inserted to make a connection, also known as a ‘female’ connector. A jack on a…
The ABC of Photography - I Incident light meter A hand-held light meter that measures the amount of light falling on a subject. IF Stands for internal focusing, and is…
The ABC of Photography - E ED A lens featuring Extra-low dispersion glass in one or more of its elements, to help correct chromatic aberration. This abbreviation is used by Nikon, Panasonic,…
DC This features on the range of Sigma lenses that are designed specifically for use with crop-factor SLRs, and which can’t be used with full-frame models. Sources: Pixabay, NASA,Wikipedia, Susan Wingfield Lamar…
Daguerre, Louis Louis Daguerre (1787-1851) was an artist and inventor who devised one of the earliest photographic processes, the daguerreotype, announced in 1839. It was made by coating a silver-plated copper sheet with light-sensitive…