FP4 |
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Speed | 125 ASA |
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Type | B&W |
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Introduced | 1968 |
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Discontinued | 1990 |
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Replaced by | FP4 plus |
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FP3 |
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/Ilford120film1955.jpg/220px-Ilford120film1955.jpg) |
Speed | 64 ASA, 125 ASA (1960) |
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Type | B&W |
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Introduced | 1942 |
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Discontinued | 1968 |
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Replaced by | FP4 |
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FP2 |
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Speed | 40 ASA |
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Type | B&W |
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Introduced | 1939 |
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Discontinued | 1942 |
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Replaced by | FP3 |
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FP |
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Speed | 40 ASA |
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Type | B&W |
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Introduced | 1935 |
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Discontinued | 1939 |
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Replaced by | FP2 |
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FP is: a cubic-grain black-and-white film from Ilford Photo with a long history. 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. 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.
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