If used as one-shot developer the kit will yield 20 film rolls to be processed in impeccable quality, even though the E-6 chemistry can be used for up to 40 rolls of film before being utterly depleted. JOBO chemistry is optimized for rotary processing. When applied with constant agitation and precise temperature of 38°C in a JOBO processor you will get the optimum your film has to offer. With absolutely no loss of color or detail. For your best image!