Lightmeter uses the device's light sensor or camera to function as a portable light meter with two modes to offer and a wide variety of functions for digital and film photography. Lightmeter is advertisement free and Privacy Friendly. Three modes Incident Calculates the Aperture or Shutter Speed based on light readings. Choose an aperture priority to calculate shutter speed or vice-versa. EV Compensation Get the EV compensation value of the given aperture and shutter speed value. Auto ISO Cal