Development time

Ilford Delta 400 in Microphen

6:30 at 20°C, stock dilution, box speed.

Start timer · 6:30

Time

6:30

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 400

B&W

All 5 times

Dilution	EI	Time	Temp	Agitation	Timer
Stock	400	6:30	20°C / 68°F	Standard	Start timer
1+1	400	8:30	20°C / 68°F	Standard	Start timer
Stock	800+1 stop	8:30	20°C / 68°F	Standard	Start timer
Stock	1600+2 stops	10:30	20°C / 68°F	Standard	Start timer
Stock	3200+3 stops	14:00	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
8:08	7:17	6:30	5:51	5:12	4:41	4:14

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)
Stock	Use as mixed, undiluted	Use as mixed, undiluted
1+1	150 ml developer + 150 ml water	250 ml developer + 250 ml water

How they work together

Microphen: Fine grain, moderate acutance, normal contrast. Good with effective speed increase.
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: Speed-enhancing developer. Good for push processing.
Pushed +1 stop. Microphen recommended by Ilford for push processing.
Pushed +2 stops.
Pushed +3 stops.

Delta 400 in other developers

D-76