Computer With Series Thyristor Circuit — 740 Ctx; Direct Flash With Computer; Bounce Flash; Manual Operation - REGULA Variant 740 CTX Manual

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The Computer check lamp (5) permits a check before a shot whether subject Conditions will yield a correct exposure. For
such a Check, mount the flash unit on the camera and point it at the subject, with the Computer set to I to IV. Wait for the
ready light (3) to light up, then operate the manual release. It the flash power is sufficient, the Computer check lamp lights
up for about 2 seconds. In that case take the picture from this viewpoint. It the distance is greater than the available flash
range (see section 2) the check lamp does not light up. In that case choose a higher Computer setting (e.g. IV) if available.
Note: The check lamp does not light up with the M setting.
4. Computer with series thyristor circuit — 740 CTX
The series thyristor Circuit preserves the excess flash energy that Is discharged with a normal Computer flash. This
therefore permits much shorter recycling times, especially with close-up shooting. The nearer the subject, the shorter the
recycling time and the greater flash capacity of a set of batteries.
Flash shots:

Direct flash with computer

Switch on the unit (2). As soon as the ready light (3) lights up, the unit is ready for shooting. Set the reflector to 0° (i.e.
horizontally). Set the computer switch to the Optimum setting for the subject (see paragraph 2 of "Vario-computer"
section). Set the corresponding aperture on the camera. Focus the camera. If necessary, check the exposure with the
computer check lamp (5) on operating the manual release (6) (only on model 740). Wait until the ready Light (3) lights up
again. Then press the camera release.

Bounce flash:

With the tilting and rotating reflector you can point the flash at a reflecting surface (ceiling, wall etc.) for particularly soft
illumination.
a) With a horizontal camera hold:
Tilt up the reflector to the required angle — 0 to 90° with engagement stops at 150 intervals.
b) With an upright camera hold:
Set the reflector to 0° and turn it sideways along its longitudinal axis to point upwards. With bounce flash with the model
740 CTX preferably make an exposure check with the computer check lamp (5) Apart from that, the flash unit and camera
are used in exactly the same way as for direct flash.

Manual Operation

Set the computer switch to M. The aperture scale (1) does away with all guide number calculations: move the slide to bring
the white index dot opposite the speed of your film and directly read off opposite each distance the aperture you have to set
on your camera. To establish the lens aperture for manual bounce flashing, count the distance from the flash unit to the
reflecting surface plus from there to the subject.
Cameras with automatic flash control:
Set the correct guide number on your camera (see technical data) and set the reflector tilt to 0°. The Computer selector