Film specifications#
- Manufacturer
- SFL
- Film
- UN75
- Speed
- 320
- Process
- B&W
- Formats
- 135-36
- Base
- Triacetate
- Made in
- Germany
- Status
- In production
Character & history#
Wolfen N 75 panchromatic cinefilm for still use.
Description adapted from Wikipedia’s “List of photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 320#
Sunny 16 for this film: f/16 at 1/320 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 |
| EV 15 · Bright sun | — | — | 1/1600 s | 1/400 s |
| EV 14 · Hazy sun | — | 1/3200 s | 1/800 s | 1/200 s |
| EV 13 · Cloudy-bright | — | 1/1600 s | 1/400 s | 1/100 s |
| EV 12 · Overcast / open shade | 1/3200 s | 1/800 s | 1/200 s | 1/50 s |
| EV 10 · Sunset | 1/800 s | 1/200 s | 1/50 s | 1/13 s |
| EV 8 · Bright interior | 1/200 s | 1/50 s | 1/13 s | 0.3 s |
| EV 5 · Home interior at night | 1/25 s | 1/6 s | 0.6 s | 2.5 s |
| EV 3 · City street at night | 1/6 s | 0.6 s | 2.5 s | 10 s |
Push & pull options#
Tell your lab how many stops you pushed or pulled so development is adjusted for the whole roll.
| Adjustment | Rate the film at | Effect |
|---|---|---|
| Pull 1 stop | EI 160 | Lower contrast, finer grain |
| Push 1 stop | EI 640 | More contrast and grain |
| Push 2 stops | EI 1,280 | Strong contrast, coarse grain, blocked shadows |
| Push 3 stops | EI 2,560 | Strong contrast, coarse grain, blocked shadows |
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 black-and-white negative film around ISO 320.
- CatLABS X FILM 320 ISO 320
- CatLABS X FILM 320 Pro ISO 320
- Foma Retropan 320 Soft ISO 320
- Kodak Tri-X ISO 320
- AgfaPhoto APX 400 ISO 400
- Argenti ARF+ Reporter Film Plus ISO 400
- Bergger Pancro 400 ISO 400
- Film Photography Project Derev Pan 400 ISO 400
- Film Photography Project New Classic EZ400 ISO 400
- Film Photography Project Svema Foto 400 ISO 400
- Film Photography Project THE MUMMY 400 ISO 400
- Film Washi 'Z' ISO 400
- Flic Film Flic UltraPan 400 ISO 400
- Foma Fomapan 400 Action ISO 400
- Foma Ortho 400 ISO 400
- Holga 400 ISO 400
- Ilford DELTA 400 ISO 400
- Ilford HP5 Plus ISO 400
More SFL films#
Frequently asked questions#
What ISO is SFL UN75?
320 — set your meter to ISO 320 for box speed.
Is SFL UN75 still made?
Yes, it is currently in production (available).
How do I develop SFL UN75?
B&W process. Traditional black-and-white development (e.g. D-76/ID-11, HC-110, Rodinal, XTOL) — easy to do at home.
Is SFL UN75 available in 35mm?
Yes — formats: 135-36.
Sources & licences#
- Wikipedia: List of photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources