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a manually operable lever before the exposure is made.
I) Automatic exposure system
If lenses with automatic pressure diaphragm are being used, two ways
of metering are possible with the automatic exposure system of the
PRAKTICA super TL.
Exposure reading with shutter speed preselected (e. g. for
objects in motion)
Shutter speed is set! Depress meter key (3) and rotate diaphragm
setting ring (6) on lens mount until the meter needle in the image field
is centred to the circular mark.
Exposure reading with aperture preselected
(e. g. for a desired depth of field)
Aperture is set! Depress meter key (3) and rotate
setting knob (14) - using only click stops - until the
meter needle is centred to the circular mark. Should
the click stop settings of knob (14) not permit a
perfectly accurate centring of the needle, fine
adjustment has to be made by means of diaphragm
setting ring (6). On pressure of meter key (3) the
diaphragm is automatically closed to the preselected
value.