A one shot high definition developer designed for use with all modern technology films (e.g. Delta & T-Max) and conventional films with speeds up to 200ISO. FX-39 is formulated to allow the highest standard of sharpness and definition for a film to be reached. Its standard dilution is 1+9 which offers short develpoing time for greater negative control. A higher dilution of 1+19 can be used as a 'compensating' developer to control high contrast.