The Praktica nova B's built-in selenium meter was not coupled to the actual shutter speed and aperture dials. Instead it was coupled to the analog exposure value calculator around the film rewind knurl. When the film speed in both ASA and DIN values was preset with the inner ring light measuring could begin. While letting the camera lens point towards the image subject and watching the meter from above the outer ring of the calculator could be turned until a little diamond symbol matched the position of the meter's needle. Then the scales on the exposure calculator's rings showed appropriate aperture/shutter-speed combinations.
The Praktica Nova were succeeded by the Praktica PL nova I and the Praktica Nova B was replaced with the Praktica PL Nova IB.