I just picked up one of these in a yard sale and do not have instructions. I have figured out how to operate it but need to know about the numbers/apertures in the sensor.

I am guessing that the number scale on the sensor relates directly to log density units and one simply sets, for example, 0.6-0.7 and place the sensor on a middle gray in the projected image and dial in the exposure time. Or, I would think you could also set the sensor for 0.2-0.3 and find a fb+fog area and calibrate for that.

Any help would be appreciated.