Film specifications#
- Manufacturer
- Ilford
- Film
- Colour Film F
- Type
- Color slide film
- Speed
- 20
- Process
- Ilford
- Formats
- 135
- Base
- Triacetate
- Made in
- UK
- Status
- Discontinued
Character & history#
General purpose slide film for clear flash bulbs.
Description adapted from Wikipedia’s “List of discontinued photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 20#
Sunny 16 for this film: f/16 at 1/20 s in bright sun. Negative film tolerates 2–3 stops of overexposure; slide film needs accuracy within about ⅓–½ stop.
| Light | f/2 | f/4 | f/8 | f/16 |
|---|---|---|---|---|
| EV 16 · Snow / beach, bright sun | 1/3200 s | 1/800 s | 1/200 s | 1/50 s |
| EV 15 · Bright sun | 1/1600 s | 1/400 s | 1/100 s | 1/25 s |
| EV 14 · Hazy sun | 1/800 s | 1/200 s | 1/50 s | 1/13 s |
| EV 13 · Cloudy-bright | 1/400 s | 1/100 s | 1/25 s | 1/6 s |
| EV 12 · Overcast / open shade | 1/200 s | 1/50 s | 1/13 s | 0.3 s |
| EV 10 · Sunset | 1/50 s | 1/13 s | 0.3 s | 1.3 s |
| EV 8 · Bright interior | 1/13 s | 0.3 s | 1.3 s | 5 s |
| EV 5 · Home interior at night | 0.6 s | 2.5 s | 10 s | 30 s |
| EV 3 · City street at night | 2.5 s | 10 s | 30 s | > 1 min |
Long exposures#
Most films suffer reciprocity failure beyond about 1 second: they need more exposure than the meter says. As a rule of thumb add ⅓–1 stop for 1–10 s and 1–2 stops beyond 10 s for older emulsions; modern T-grain films (and Fuji Acros) need much less. Check the manufacturer's datasheet.
Similar films#
Other color slide film around ISO 20.
- ORWO UK 14 ISO 20 · disc.
- Agfa Umkehrfilm K ISO 16 · disc.
- ORWO UT 13 ISO 16 · disc.
- 3M Dynachrome 25 ISO 25 · disc.
- ADOX C 15 ISO 25 · disc.
- Agfa Agfacolor Umkehrfilm K ISO 25 · disc.
- Agfa Agfacolor Umkehrfilm T ISO 25 · disc.
- Efke Color RD15 ISO 25 · disc.
- Ferrania Ferraniacolor ISO 25 · disc.
- ORWO UT 15 ISO 25 · disc.
More Ilford films#
Frequently asked questions#
What ISO is Ilford Colour Film F?
20 — set your meter to ISO 20 for box speed.
Is Ilford Colour Film F still made?
No, it has been discontinued (1956–1960).
How do I develop Ilford Colour Film F?
Ilford process.
Is Ilford Colour Film F available in 35mm?
Yes — formats: 135.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources