An essential tool for film photography. Designed to function like a real spot meter, Spot Meter Pro measures light within a 2° circular angle of view for accurate exposure value readings. Select your film speed, then adjust aperture or shutter speed for Av or Tv priority. Optionally, adjust the “middle-grey” reading using the Zone System or Tone Picker metering modes to achieve your desired exposure. Additional features: - Customize aperture, shutter speed, and film speed increments and range - Log readings for future reference - iOS devices equipped with a telephoto lens can take a 1° circular angle of view reading - Calibrate the light meter in 1/10th increments - Toggle black & white mode