Film specifications#
- Manufacturer
- CatLABS
- Film
- X FILM 320
- Speed
- 320
- Process
- B&W
- Formats
- 135
- Base
- Triacetate
- Made in
- USA
- Status
- In production
Character & history#
Medium-speed film, with distinct grain quality, contrast and tonal range, wider exposure latitude up to EI of 1600. Hand rolled onto reloadable cassettes, film edge markings state '5222' indicating this to be Kodak Double-X film stock.
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 Pro ISO 320
- Foma Retropan 320 Soft ISO 320
- Kodak Tri-X ISO 320
- SFL UN75 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 CatLABS films#
Frequently asked questions#
What ISO is CatLABS X FILM 320?
320 — set your meter to ISO 320 for box speed.
Is CatLABS X FILM 320 still made?
Yes, it is currently in production (2019-).
How do I develop CatLABS X FILM 320?
B&W process. Traditional black-and-white development (e.g. D-76/ID-11, HC-110, Rodinal, XTOL) — easy to do at home.
Is CatLABS X FILM 320 available in 35mm?
Yes — formats: 135.
Sources & licences#
- Wikipedia: List of photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources