Film specifications#
- Manufacturer
- Silberra
- Film
- S25
- Speed
- 25
- Process
- B&W
- Formats
- 135-36
- Base
- Polyester (PET)
- Made in
- Russia
- Status
- In production
Character & history#
Limited edition extra fine grain, moderate contrast and high resolution with extended red sensivity - Can be used as an IR film with suitable filter. Limited to 800 rolls.
Description adapted from Wikipedia’s “List of photographic films” (CC BY-SA 4.0).
Exposure guide at ISO 25#
Sunny 16 for this film: f/16 at 1/25 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 | 1/60 s |
| EV 15 · Bright sun | 1/2000 s | 1/500 s | 1/125 s | 1/30 s |
| EV 14 · Hazy sun | 1/1000 s | 1/250 s | 1/60 s | 1/15 s |
| EV 13 · Cloudy-bright | 1/500 s | 1/125 s | 1/30 s | 1/8 s |
| EV 12 · Overcast / open shade | 1/250 s | 1/60 s | 1/15 s | 1/4 s |
| EV 10 · Sunset | 1/60 s | 1/15 s | 1/4 s | 1 s |
| EV 8 · Bright interior | 1/15 s | 1/4 s | 1 s | 4 s |
| EV 5 · Home interior at night | 0.5 s | 2 s | 8 s | 30 s |
| EV 3 · City street at night | 2 s | 8 s | 30 s | > 1 min |
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 12 | Lower contrast, finer grain |
| Push 1 stop | EI 50 | More contrast and grain |
| Push 2 stops | EI 100 | Strong contrast, coarse grain, blocked shadows |
| Push 3 stops | EI 200 | 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 25.
- Film Photography Project Eastman Kodak Hi-Con 2369 ISO 25
- Film Photography Project Sonic 25 BW Film ISO 25
- Film Washi 'W' ISO 25
- Rollei Blackbird ISO 25
- Rollei Ortho 25 Plus ISO 25
- Rollei RPX 25 ISO 25
- ADOX CMS 20 II PRO ISO 20
- Argenti Nanotomic X ISO 32
- SPUR DSX ISO 32
- Agfa Agfaortho 25 Professional ISO 25 · disc.
- Agfa Agfapan 25 Professional ISO 25 · disc.
- Agfa Agfapan APX 25 ISO 25 · disc.
- Efke KB 25 / R 25 / PL 25 M ISO 25 · disc.
- Foma Mikropan 15 ISO 25 · disc.
- Kodak Technical Pan ISO 25 · disc.
- ORWO NP 15 ISO 25 · disc.
- ORWO PAN 25 ISO 25 · disc.
- ADOX KB 14 / R 14 ISO 20 · disc.
More Silberra films#
Frequently asked questions#
What ISO is Silberra S25?
25 — set your meter to ISO 25 for box speed.
Is Silberra S25 still made?
Yes, it is currently in production (2020-).
How do I develop Silberra S25?
B&W process. Traditional black-and-white development (e.g. D-76/ID-11, HC-110, Rodinal, XTOL) — easy to do at home.
Is Silberra S25 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