Development time

Foma Bohemia Retropan 320 Soft in Microphen

10:30 at 20°C, stock dilution, box speed.

Start timer · 10:30

Time

10:30

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 320

B&W

Development time

Dilution	EI	Time	Temp	Agitation	Timer
Stock	320	10:30	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
13:08	11:46	10:30	9:27	8:24	7:34	6:50

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.
Foma Bohemia Retropan 320 Soft: Designed for retro aesthetics with soft glow effect. Low contrast ideal for contact printing and vintage look.
Notes on this pairing: Official Foma time. Range 10:00-11:00, midpoint used.

Retropan 320 Soft in other developers

HC-110