Gossen Sixtomat J exposure meter.
The Sixtomat J is a highly sensitive photo-electric exposure meter,
suitable for the measurement of reflected as well as incident light for
still photography and cine works for color and for black and white. The
meter is fully automatic and shock proof. The Sixtomat J is the successors of the Sixtomat
type I and type II.
Where the Sixtomat only can measure reflected light, the Sixtomat J can also
measure incident light by means of the roller blind. The roller blind
acts as a diffuser. The roller blind is painted on the
inside with a kind of silver colored paint leaving a unpainted square in
the middle. If the roller blind is opened until the red markings on the
front, the meter is enabled for measuring incident light.
This Sixtomat is also equipped with an internal switch for changing the
sensitivity mode. (the red button on the former meters). The switch is
activated going from the red to the black scale and vice versa.
The meaning from the 'J' in the name is still not very clear.