Efke (Fotokemika) Efke KB 25 / R 25
Single-layer 1950s-style ortho-panchromatic emulsion from Croatia.
ISO
25
Formats
3
35mm, 120, 4x5
Process
BW
Type
B&W
Characteristics
Reciprocity Failure
No official data available. The manufacturer hasn't published reciprocity specifications for this film.
For long exposures, try starting with a 1.3 exponent (t' = t1.3) as a baseline and bracket your shots. This is a reasonable middle ground that works for many films.
No manufacturer reciprocity data found; test or bracket long exposures.
Help improve this page. Some information for this film is limited. If you have experience shooting Efke KB 25 / R 25 or know of published data we're missing, we'd love to hear from you.
Get in touchDescriptions combine manufacturer specifications with community experience. Subjective assessments reflect common sentiment among photographers and may not match your results.