Development time

Ilford Delta 400 in Ilfotec DD-X

9:30 at 20°C, 1+4 dilution, box speed.

Start timer · 9:30

Time

9:30

Standard

Dilution

1+4

Temperature

20°C

Box speed

ISO 400

B&W

All 4 times

Dilution	EI	Time	Temp	Agitation	Timer
1+4	400	9:30	20°C / 68°F	Standard	Start timer
1+4	800+1 stop	10:30	20°C / 68°F	Standard	Start timer
1+4	1600+2 stops	13:30	20°C / 68°F	Standard	Start timer
1+4	3200+3 stops	18:00	20°C / 68°F	Standard	Start timer

EI is the speed the film was rated at when shooting. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet.

Other temperatures

18°C	19°C	20°C	21°C	22°C	23°C	24°C
11:53	10:38	9:30	8:33	7:36	6:50	6:11

Calculated from the 20°C time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18°C and 24°C.

Mixing

Dilution	300 ml (one 35mm roll)	500 ml (one 120 roll)
1+4	60 ml developer + 240 ml water	100 ml developer + 400 ml water

How they work together

Ilfotec DD-X: Fine grain, high acutance, full film speed, normal contrast. Full emulsion speed with excellent shadow detail.
Ilford Delta 400: Modern T-grain film with fine grain and high sharpness. Core-shell crystal technology provides excellent detail. More contrast than HP5 with less pushability.
Notes on this pairing: Ilford recommended normal contrast. Good for push processing.
Pushed +1 stop. DDX recommended by Ilford for push processing.
Pushed +2 stops.
Pushed +3 stops.

Delta 400 in other developers

D-76