Praktica FX2 - The Lenses; The Pre-setting Diaphragm

The Lenses
The Praktica FX z may be used with normal or special-
type lenses with focal lengths from J 5 mm to 500 mm and
with speeds up to f/ 1 . 5 , hence making it possible to pene¬
trate into practically any sphere of photography.
All the lenses are easily interchangeable by means of their
threaded mounts. It is advisable, before changing the lens,
to release the camera shutter, so that the mirror, a very
sensitive clement, will be protected from damage. Any
unclean spots on the anti-reflex coating should be removed
only with a soft, perfectly clean and grease-free brush. In
case there is a film in the camera during lens change, take
care to protect the opening from glaring light.
The Pre-setting Diaphragm
When exchanging lenses with the diaphragm pre-setting
device, make sure that the pressure lever ( 2 ) always rests
against the rear stop. If necessary, push it to the rear stop
with your finger tip. Should the camera be equipped with
an automatic pre-set lens, the arrest-
^ ing knob (i) with the red dot has to
be moved to the left (looking at the
camera from the front).