Abstract: A Programmable Computing Enlarging Exposure Meter determines printing and contrast grades and shadow speeds and contrast grades of photosensitive material measuring printing density and contrast of film in its light path, with its unique analog computer it determines the necessary contrast grade and the exposure time required to produce a print of the necessary density. All computations and determinations are performed internally without requiring user extrapolating in the dark with calculator dials and attached slide rules that are the practice with instruments designed for the purpose.The structure comprises a power supply, light measuring device, a light to voltage converter for converting the light measurement to one or more linearly proportional voltages having range of 1:10 between them.An operational amplifier produces fixed output voltage. An R.sub.1 inverting input variable log taper resistor calibrated against the paper speed and paper grade scales on the front panel, an R.sub.