Silberra (Russie)
Silberra S25
ISO 25 N&B ultra-fine Expert
~12–18 €
Silberra S25 is a panchromatic ISO 25 B&W film from Silberra (Saint Petersburg, Russia), made by TASPIR (Kazan). Ultra-fine grain, very high acutance, a thick polyester base. The slowest, finest emulsion in the Silberra range. In enlargement, a 35mm S25 negative can rival medium format for resolution.
Atouts
+ Ultra-fine grain — maximum resolution for a 35mm film
+ Thick polyester base — ideal dimensional stability for scanning
+ A repurposed Russian military emulsion — unique character
Limites
− ISO 25 — a tripod is nearly essential outside bright sun
− Limited availability in France
− Polyester base — check compatibility with certain cameras
Silberra's S25 is based on a Russian military microfilm emulsion repurposed for civilian photography — a Soviet tradition of putting technical stock to new use. Its thick polyester base sets it apart from every Western ISO 25 film. For photographers demanding maximum resolution from their lenses who aren't afraid of ISO 25's constraints.
Caractéristiques techniques
Grain
ultra-fine
Contraste
medium
Popularité
Rare
Format 120
Non disponible
Nombre de poses
36 poses
Base du film
Polyester
Sensibilité spectrale
Superpanchromatique
Conservation
refrigeration recommended
Péremption typique
2–5 years depending on storage
Développement maison
yes — easy
Niveau recommandé
Expert
| Process | N&B standard |
| Révélateurs | D-76, Rodinal 1+50 à 1+100, ID-11, XTOL |
| Temps / température | 20°C — D-76 stock : 6min | Rodinal 1+50 : 10min | Rodinal 1+100 : 20min (stand dev — résultats optimaux) | ID-11 stock : 6min | XTOL 1+1 : 8min |
| Usage recommandé | landscape, architecture, infrarouge |
| Revendeurs France | Retrocamera.be |
