Efke KB 25, KB 50, KB 100
Efke films are manufactured using classic emulsions with very high silver content. This results in a large exposure latitude and superior grayscale reproduction. The Efke 25, 50 and 100 films are made using the ADOX formulas that were first introduced back in the 1950s.
Efke products are true to their rated speed. Unlike modern flat crystal films, which are very unforgiving to use, these films allow beginners to produce quality images. The nature of the film also easily allows large, grain free, enlargements to be made from negatives.
- KB = 35mm format, R = 120 roll film, and PL = Sheet film (from German: planfilm).
- M on sheet films means Matte emulsion.
- KB (35mm) films are on acetate, roll and sheet films are on a polyester base.
- Efke films are produced using the dipping/vertical coating method.
- Efke films have a standard grain structure. They are not a T-grained emulsion.
- Films can be pushed one stop for increased speed and optimum differentiation of highlights
- Do NOT over-expose Efke Emulsions! This film is not recommended for pull processing.
- Treat the wet emulsion with extreme care. Using a hardener is recommended
- Never use a stop-bath with a higher concentration than 2% - plain water is recommended.
EFKE KB-25 AND EFKE R-25
KB 25 and R 25 are thin-layer black-white negative films of very fine grain, which proporties together with the coinciding grade provide the highest possible edge sharpness. KB 25 and R 25 resolving power is 115 lines per milimetre. These films find their applications particularly in technical and professional photography. Sensitivity of Efke 25 is 14 DIN (20 ASA, ISO 20/14° GOST 18), but by developing in coinciding developers effecting Efkes sensitivity utilization may be even twice increased to 100 ISO. This film is orthopanchromatic, making it less sensitive to the red end of the spectrum than standard pan film.
SPECTRAL SENSITIVITY EFKE KB25 & R25
EFKE KB-50 AND EFKE R-50
KB 50 and R 50 are thin-layer black-white negative films. Efkes thin-layer photographic emulsion, fine-grain structure and coinciding contrast grade provide high edge sharpness and possibility for making large enlargements. Resolving power is 105 lines per milimetre. Sensitivity of Efke 50 is 17 DIN (40 ASA, ISO 40/17°, GOST 35), but by developing them in adequate developers films sensitivity utilization may be even twice increased to 200 ISO. This film is orthopanchromatic, making it less sensitive to the red end of the spectrum than standard pan film.
SPECTRAL SENSITIVITY EFKE KB50 & R50
EFKE KB-100 / EFKE R-100 / EFKE PL-100M
KB 100, R 100 and PL 100M are medium-speed panchromatic black-white negative films. A thin layer of the photographic emulsion and fine grain structure provide high edge sharpness of negatives. Black-white sheet negative film EFKE PL-21M, which is of the same characteristics as the Efke KB 100 and Efke R 100, is primarly intended for portraiture photography, advertisement photography etc. Efkes harmonized panchromatic sensitization is guarantee that these films may be equally successfully applied with daylight and artificial illumination. Resolving power of 100 ISO films is 90 lines/mm. Films sensitivity is 21 DIN (100 ASA, ISO 100/21°, GOST 90), but by developing them in adequate developers Efkes speed utilization may be even twice increased to 400 ISO.
KB 400 is a high-quality b/w film which is thought to be a duplicate of Ilford HP5+, although there is no documentation to confirm this suggestion. What is certain is that the film performs extremely well when compared to other 400 ISO products. Data for HP5+ can be used as starting points for determining Dev .