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is a series of photographic film
Photographic film is a sheet of plastic coated with an emulsion containing light-sensitive silver halide salts with variable crystal sizes that determine the sensitivity, contrast and resolution of the film...
s manufactured by Harman Technology Limited. Delta
films are tabular-grain
Tabular-grain film is a type of photographic film that includes nearly all color films, T-MAX films from Kodak , Delta films from Ilford Photo and the Fujifilm Neopan films...
Black-and-white, often abbreviated B/W or B&W, is a term referring to a number of monochrome forms in visual arts.Black-and-white as a description is also something of a misnomer, for in addition to black and white, most of these media included varying shades of gray...
Ilford recommends Delta 100 and 400 as replacements for the discontinued Agfa
AgfaPhoto GmbH is a European photographic company, formed in 2004 when Agfa-Gevaert sold their Consumer Imaging division. Agfa had for many years been well known as a producer of consumer-oriented photographic products including films, photographic papers and cameras...
APX100 and APX400 films, respectively.
The 'Delta 3200' product is not actually rated at ISO 3200/36°. Its speed is only ISO 1000/31° but it has a very wide exposure latitude. Thus it can be successfully push processed
Push processing in photography, sometimes called uprating, refers to a film developing technique that increases the effective sensitivity of the film being processed. Push processing involves developing the film for more time, possibly in combination with a higher temperature, than the...
to EI 3200 or even higher. Delta 3200 was introduced in 1998, 10 years after Kodak's similar T-MAX P3200
Kodak Professional T-MAX Film is a continuous tone, panchromatic, tabular-grain black and white negative film made by Eastman Kodak. It is sold in three speeds: 100, 400 and 3200...
. It replaced Ilford's high speed 'HPS' film.