Английская Википедия:Ilford FP

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FP is a cubic-grain[1] black-and-white film from Ilford Photo with a long history.[2] It originated as Fine grain Panchromatic roll film in 1935. Like its faster partner product, HP film, it has gone through a number of versions since then, with the latest being FP4 plus (FP4+ for short).

The film is known for being versatile, with usable results even when underexposed two stops or overexposed six stops.[3] This is due to the fact that FP4 features a double layer emulsion. It combines a low sensitive fine grain layer and a highly sensitive layer with larger grains. This kind of film was already known in the 1920s and 1930s (e.g. Agfa Isopan F 17/10° DIN). Being perfect for the amateur's 6x9 roll film cameras these old types lacked sharpness in the 24 x 36 mm format due to the overall thickness of both layers. But the FP4 of 1968 combined an amateur-friendly double layer emulsion with the sharpness of a typical thin layer emulsion. This was possible because both layers together were only 7.5 µm thick.[4]

References

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External links

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  1. Шаблон:Cite web
  2. Шаблон:Cite web
  3. Ошибка цитирования Неверный тег <ref>; для сносок ilfordphoto.com не указан текст
  4. Шаблон:Cite book