ISO 100/21°

KB-100, R-100 and PL-100M are high panachromatically sensitized 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, advetisement 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.