Development time

Ilford SFX 200 in Microphen

8:30 at 20°C, stock dilution, box speed.

Start timer · 8:30

Time

8:30

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 200

B&W

All 3 times

Dilution	EI	Time	Temp	Agitation	Timer
Stock	200	8:30	20°C / 68°F	Standard	Start timer
Stock	400+1 stop	10:30	20°C / 68°F	Standard	Start timer
Stock	800+2 stops	14:30	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
10:38	9:31	8:30	7:39	6:48	6:07	5:32

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

How they work together

Microphen: Fine grain, moderate acutance, normal contrast. Good with effective speed increase.
Ilford SFX 200: Extended red sensitivity up to 740nm. Creates infrared-style effects with 720nm filter. Not true IR film but produces similar aesthetic.
Notes on this pairing: Pushed +1 stop.
Pushed +2 stops.

SFX 200 in other developers

D-76