Enlarger
a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies
An enlarger is a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies.
Construction
All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear could be used in both camera and enlarger. Enlarger lenses, like the dialyte construction, are generally symmetrical in design or nearly so, optimised for sharp focus at 2x to 10x magnification. The light passes through a film holder, which holds the exposed and developed photographic negative or transparency.
Prints made with an enlarger are called enlargements. Typically, enlargers are used in a darkroom, an enclosed space from which extraneous light may be excluded; some commercial enlargers have an integral dark box so that they can be used in a light-filled room.
History
Josef Maria Eder, in his History of Photography attributes the invention of photographic enlargement to Humphry Davy who realised the idea of using a solar microscope to project images onto sensitised paper. In June 1802, Davy published in the first issue of the Journals of the Royal Institution of Great Britain his An Account of a Method of Copying Paintings upon Glass, and of Making Profiles, by the Agency of Light upon Nitrate of Silver. Invented by T. Wedgwood, Esq. With Observations by H. Davy in which he described their experiments with the photosensitivity of silver nitrate.
The public source identifies “Enlarger” as a specialized transparency projector used to produce photographic prints from film or glass negatives, or from transparencies. This brief keeps that definition visible, then builds a research path around Enlarger, specialized and transparency.
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Object files, edition statements, performance records and contemporary criticism preserve different stages of the work’s history. The source revision retrieved here is dated Aug 26, 2026. The linked authority identifier is Q474642. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1802.
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This entry incorporates text from “Enlarger” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.