Ilford Delta

Ilford Delta is a series of photographic films manufactured by Harman Technology Limited. Delta films are tabular-grain black-and-white films, ^[2] and originally released in 400 ISO only to compete with Kodak's T-Max film.^[3]

Delta 100
Maker	Ilford Photo
Speed	100/21°
Type	B&W print
Process	Gelatin-silver
Format	35mm,[1] 120, sheet film
Application	General, portraits
Introduced	1992

Delta 400
Speed	400/27°
Push	EI 3200/36°
Type	B&W print
Format	35mm, 120
Application	General, sports
Introduced	1992

Delta 3200
Speed	1000/31°
Push	EI 3200/36° or much more
Type	B&W print
Format	35mm, 120
Application	General, sports, low-light
Introduced	1998

Ilford recommends Delta 100 and 400 as replacements for the discontinued Agfa APX100 and APX400 films, respectively.^[4] Delta 100 can be used at ISO speeds of 50 to 200.^[5]

Delta 3200

The 'Delta 3200' product is not actually rated at ISO 3200/36°. Its speed is only 1000/31° following the ISO methods, but it has a very wide exposure latitude. Thus it can be successfully push processed to EI 3200 or 6400, or even 12500.^[1] Delta 3200 was introduced in 1998, 10 years after Kodak's similar T-MAX P3200. It replaced Ilford's high speed 'HPS' film.

Delta 400

Delta 400 can also be pushed to EI 3200.