Film specifications#
- Manufacturer
- Efke
- Film
- KB 100 / R 100 / PL 100 M
- Speed
- 100
- Process
- B&W
- Formats
- 135, 127, 120, sheet film
- Base
- Triacetate
- Made in
- Croatia
- Status
- Discontinued — replaced by ADOX CHS 100 II
Character & history#
Ortho-panchromatic classic 1950s style emulsion. 135 (KB 100), 120 (R 100), 127 (R 100-127) and sheet size (PL 100 M 4×5, 5×7 and 8×10). Sheet film has retouchable back. The same film was subsequently produced for ADOX by Inoviscoat, Germany as ADOX CHS 100 II.
Description adapted from Wikipedia’s “List of discontinued photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 100#
Sunny 16 for this film: f/16 at 1/100 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 | — | — | 1/1000 s | 1/250 s |
| EV 15 · Bright sun | — | 1/2000 s | 1/500 s | 1/125 s |
| EV 14 · Hazy sun | — | 1/1000 s | 1/250 s | 1/60 s |
| EV 13 · Cloudy-bright | 1/2000 s | 1/500 s | 1/125 s | 1/30 s |
| EV 12 · Overcast / open shade | 1/1000 s | 1/250 s | 1/60 s | 1/15 s |
| EV 10 · Sunset | 1/250 s | 1/60 s | 1/15 s | 1/4 s |
| EV 8 · Bright interior | 1/60 s | 1/15 s | 1/4 s | 1 s |
| EV 5 · Home interior at night | 1/8 s | 0.5 s | 2 s | 8 s |
| EV 3 · City street at night | 0.5 s | 2 s | 8 s | 30 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 50 | Lower contrast, finer grain |
| Push 1 stop | EI 200 | More contrast and grain |
| Push 2 stops | EI 400 | Strong contrast, coarse grain, blocked shadows |
| Push 3 stops | EI 800 | 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 100.
- ADOX CHS 100 II ISO 100
- AgfaPhoto APX 100 ISO 100
- Argenti Pan-X ISO 100
- Film Photography Project BW 100 ISO 100
- Film Photography Project Derev Pan 100 ISO 100
- Film Photography Project Emulsion X ISO 100
- Film Photography Project Let It Snow ISO 100
- Film Photography Project Svema Foto 100 ISO 100
- Film Photography Project Tasma NK-2 ISO 100
- Film Photography Project WolfMan ISO 100
- Film Photography Project X-Ray Film ISO 100
- Film Washi 'F' ISO 100
- Film Washi 'K' ISO 100
- Film Washi 'P' ISO 100
- Film Washi 'V' ISO 100
- Film Washi 'Y' ISO 100
- Flic Film 'Wolfen 100' ISO 100
- Flic Film Flic UltraPan 100 ISO 100
More Efke films#
Frequently asked questions#
What ISO is Efke KB 100 / R 100 / PL 100 M?
100 — set your meter to ISO 100 for box speed.
Is Efke KB 100 / R 100 / PL 100 M still made?
No, it has been discontinued (1990s–2012).
How do I develop Efke KB 100 / R 100 / PL 100 M?
B&W process. Traditional black-and-white development (e.g. D-76/ID-11, HC-110, Rodinal, XTOL) — easy to do at home.
Is Efke KB 100 / R 100 / PL 100 M available in 35mm?
Yes — formats: 135, 127, 120, sheet film.
Sources & licences#
- Wikipedia: List of discontinued photographic films — CC BY-SA 4.0
Last updated October 03, 2026 · How we calculate · Sources