Praktica LTL Instructions for Use
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O. Flash exposures
The shutter of the PRAKTICA LTL is
desig-ned for synchronization with flash bulbs
and electronic flash units.
When the flash unit is attached to the came-
ra, the electric connection between camera and
unit is automatically effected by means of the
centre contact (9) in accessory shoe (8). Thus,
no synchronization cord is required. Modern
flashbulb and electronic units are equipped for
this purpose with a suitable accessory shoe
fitting.
For the use of flash units fitted with a syn-
chronization card, an adapter piece with flash
socket to accept the plug of the card has to be
pushed into the accessory shoe of the
PRAKTICA LTL.
Flash bulb exposures
In connection with bulbs for short flash duration, the shutter has to be set for a speed of 1/30 sec. –
marked by the lamp symbol – or slower. The ignition circuit is closed only as long as the shutter runs
down. No contact is made during the cocking procedure, so that flash bulbs can be exchanged also
before the shutter is cocked.
Electronic flash exposures
Owing to the extremely rapid travel of the curtains in the metal-bladed focal-plane shutter,
synchronization is possible up to a shutter speed of 1/125 sec. The knob for setting the shutter speeds
has to be moved to the flash symbol setting
next to “B”.
The guide number
The diaphragm numeral to be set on the lens mount for flash exposures can be found with the aid of
the “guide number”. Manufacturers of bulbs and electronic flash units give these guide numbers on the
wrappings or in the instructions for use as required for the various sensitivity grades of the films. The
correct aperture is determined by dividing the guide number for the flash in use by the flash-to-subject
distance figure. Formula for the flash unit attached to the accessory shoe of the camera:
Diaphragm numeral =
guide number
flash-to-subject distance
