Development time

Foma Bohemia Foma Ortho 400 in ID-11

7:00 at 20°C (68°F), stock dilution, box speed.

Time: 7:00
Dilution: Stock
Temperature: 20°C
Box speed: ISO 400

All 2 times

Dilution	EI	Time	Temp	Agitation	Evidence	Timer
Stock	400	7:00	20°C / 68°F	Standard	ManufacturerChecked Oct 2026	Start timer
Stock	400	2:30	30°C / 86°F	Standard	ManufacturerChecked Oct 2026	Start timer

EI is the speed the film was rated at when shooting. Evidence says where each time comes from: the manufacturer’s own data, a named test, a compilation or several agreeing reports (community consensus), or one person’s report. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet. Where sources give different times, every one is listed and marked “sources differ”.

Other temperatures

18°C64°F	19°C66°F	20°C68°F	21°C70°F	22°C72°F	23°C73°F	24°C75°F
8:45	7:50	7:00	6:18	5:36	5:02	4:33

Calculated from the 20°C (68°F) time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18–24°C (64–75°F).

Mixing

Dilution	300 ml (10.1 fl oz) (one 35mm roll)	500 ml (16.9 fl oz) (one 120 roll)
Stock	Use as mixed, undiluted	Use as mixed, undiluted

How they work together

ID-11: Fine grain, moderate acutance, full film speed, normal contrast. Excellent balance of fine grain, sharpness, and tonal rendition.
Foma Bohemia Foma Ortho 400: Orthochromatic black-and-white negative film, ISO 400/27 (Foma datasheet: RMS 17.5, 85 lp/mm), with high green sensitivity and high maximum density; handle under orange safelight (585 nm and above), never green. Sold as 120, 35mm 135-36 and sheet film (sheet sizes not stated).
Notes on this pairing: Datasheet gives one row for ID-11 and D-76 stock. Datasheet gives 7 to 8 min; lower figure used.
Datasheet gives one row for ID-11 and D-76 stock. Datasheet alternative at 30 °C.

Foma Ortho 400 in other developers

Other films in ID-11

All 35 films in ID-11