Film specifications#
- Manufacturer
- ORWO
- Film
- UT 23
- Type
- Color slide film
- Speed
- 160
- Process
- ORWO 9165
- Formats
- 135, 120
- Base
- T/P
- Made in
- GDR
- Status
- Discontinued
Character & history#
High speed slide film for daylight. Roll films had PET base.
Description adapted from Wikipedia’s “List of discontinued photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 160#
Sunny 16 for this film: f/16 at 1/160 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 | — | — | 1/1600 s | 1/400 s |
| EV 15 · Bright sun | — | 1/3200 s | 1/800 s | 1/200 s |
| EV 14 · Hazy sun | — | 1/1600 s | 1/400 s | 1/100 s |
| EV 13 · Cloudy-bright | 1/3200 s | 1/800 s | 1/200 s | 1/50 s |
| EV 12 · Overcast / open shade | 1/1600 s | 1/400 s | 1/100 s | 1/25 s |
| EV 10 · Sunset | 1/400 s | 1/100 s | 1/25 s | 1/6 s |
| EV 8 · Bright interior | 1/100 s | 1/25 s | 1/6 s | 0.6 s |
| EV 5 · Home interior at night | 1/13 s | 0.3 s | 1.3 s | 5 s |
| EV 3 · City street at night | 0.3 s | 1.3 s | 5 s | 20 s |
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 160.
- Rollei CrossBird ISO 200
- Agfa Agfachrome 200 RS ISO 200 · disc.
- Agfa Agfachrome CT 200 ISO 200 · disc.
- Agfa Agfachrome RSX 200 ISO 200 · disc.
- Agfa Agfachrome RSX II 200 ISO 200 · disc.
- Agfa CTprecisa 200 ISO 200 · disc.
- Foma Fomachrom-II D 24 ISO 200 · disc.
- Fujifilm Fujichrome Sensia 200 ISO 200 · disc.
- Ilford Ilfochrome 200 ISO 200 · disc.
- Kodak Ektachrome E200 ISO 200 · disc.
- Kodak Ektachrome Professional Infrared EIR Film ISO 200 · disc.
- Lomography Peacock X-Pro ISO 200 · disc.
- Lomography XPro 200 ISO 200 · disc.
- Foma Fomachrom D 22 ISO 125 · disc.
- Foma Fomachrom-II D 22 ISO 125 · disc.
More ORWO films#
Frequently asked questions#
What ISO is ORWO UT 23?
160 — set your meter to ISO 160 for box speed.
Is ORWO UT 23 still made?
No, it has been discontinued (1982–1989).
How do I develop ORWO UT 23?
ORWO 9165 process.
Is ORWO UT 23 available in 35mm?
Yes — formats: 135, 120.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources