Praktica FX2 - Automatic Diaphragm Operation

The new Automatic Diaphragm
For lenses with automatic diaphragm, the Praktlca FX i has been
equipped with a special release mechanism. Lenses of this type offer
a considerable facility with regard to readiness for action owing to
the fact that the diaphragm closes down automatically to the pre-set
stop. Remove the lens from the camera, and the release mechanism
for the automatic diaphragm becomes visible inside the camera
front. This meclianism has to be disconnected if other lenses than
those with automatic diaphragm are to
For lenses with automatic diaphragm,
the meclianism is put into working
position by pushing the red-marked
knob to the left.
To wind up the automatic diaphragm, turn the front tensioning ring
on the lens mount as far as it will go to the right. The aperture
selected for the exposure is adjustable on the same ring by means
of a locking device either before or after the shutter is wound up.
Meyer lenses with automatic diaphragm need not to be wound up.
Intermediate tubes to be used with automatic lenses must be
marked “2“.