Orthopanchromatic B&W Negative Film ISO 100/21° in Standard Process Super Fine Grain Structure Broad Tonal Range and High Sharpness Excellent Reciprocity Characteristics Neopan 100 Acros from Fujifilm is an orthopanchromatic black and white negative film designed for general use in a wide variety of shooting conditions. It features a medium speed nominal sensitivity of ISO 100/21° when developed in standard black and white chemistry and exhibits a broad tonal range with a super fine grain structure and high sharpness. It also features excellent reciprocity characteristics, making it well-suited for long exposure use.