Ilford HP

HP is a cubic-grain black-and-white film from Ilford Photo with a long history.[2] It originated as Hypersensitive Panchromatic plates in 1931. Since then it has progressed through a number of versions, with HP5 plus (HP5+ for short) being the latest. The main competitor of Ilford HP5 Plus is Kodak Tri-X 400.

HP5 plus
MakerIlford Photo
Speed400/27°[1]
Push3200/36°
TypeB&W print
ProcessGelatin-silver
Format35mm, 120, sheets, disposable camera
ApplicationGeneral
Introduced1989
HP5
Speed400/27°
TypeB&W
Introduced1976
Discontinued1989
Replaced byHP5 plus
HP4
Speed400/27°
TypeB&W
Introduced1965
Discontinued1976
Replaced byHP5
HPS
Speed400/27°,
800/30° (1960)
TypeB&W
Graincoarse
Introduced1954
Discontinued1998
Replaced byDelta 3200
HP3
Speed125/22°,
200/24° (1952–53),
400/27° (1960)
TypeB&W
Introduced1941
Discontinued1969
Replaced byHP4
HP2
Speed200/24°
TypeB&W
Introduced1939
Discontinued1941
Replaced byHP3
HP
Speed160/23°
TypeB&W
Introduced1935
Discontinued1939
Replaced byHP2

HP3 went through two speed changes in its history, but only one actual change to the emulsion. In 1960 the 200 ISO/ASA emulsion was relabeled as 400 ISO/ASA with no change to the product. The 200 ISO/ASA speed included an exposure safety margin, but with improvements in light meters this was deemed unnecessary, thus the speed was revised up to 400 ISO/ASA.

On September 23, 2005, Ilford reintroduced its black-and-white single-use camera which includes 27 exposures of HP5 plus film.[3]

References
  1. https://www.ilfordphoto.com/amfile/file/download/file/1903/product/694/
  2. "Ilford History and Chronology". Retrieved 2008-07-27.
  3. "BLACK AND WHITE MADE EASY" (Press release). Ilford Photo. 2005-09-23. Archived from the original on 2012-02-06. Retrieved 2007-03-20.
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