What contribution did John Herschel make to photography?

Another person who has to mention is Sir John Herschel, a British astronomer. He once took his first photo with a telescope and worked out how to fix the image on the glass. The earliest existing photo printed on glass was taken by him in September 1839.

1839 65438 On March 4th, Herschel submitted a report on photography technology to the Royal College of England, in which 23 photos were printed on paper and its substrate, including the first photo he took with a telescope, the sculpture made by superposition and the printed matter reproduced by photography.

In addition, Herschel also explored adhesives. 1839 he did an experiment: put a piece of glass under a pot of silver chloride solution and let the silver chloride solution slowly deposit on the glass plate. This experiment provided beneficial enlightenment for later researchers. Later, he suggested that Talbot use hypo instead of salt as fixing agent to fix the image. These experiments and ideas promoted the birth of photography.

Herschel's greatest contribution to photography is the standardization of photographic terms. As early as 1839 65438+ 10, he wrote down "photography" (a photography verb) and "photography adjectives" for the first time in his notes. On March 14 of the same year, he first used the word "photography" (from Greek, that is, "painting with light") in his report to the Royal Academy. Herschel also put forward "negative film" (referring to the effect of shooting in a black box by Talbot's method) and "positive film" (referring to the photos printed with "negative film" with correct tone). Twenty years later, he first used the new term "snapshot".