1. But without training, without some kind of light meter, how would you know?

2. Light Meter EVERFINE-PLA-30 Spectrometer Illuminance Meter Actinometer Brightness Test Tool Brand: EVERFINE

3. For example, it checks whether the proper light meter/filter notch has been stamped out.

4. After this, the notches (for the light meter and daylight filter if required) are stamped on.

5. The Arette IA is a simple viewfinder; Arette IB has a light meter; the Arette IC added a coupled rangefinder, and the Arette ID (which became the Arette 1DN) has both meter and rangefinder.