Fitting batteries: Push the lid (7) downwards as shown by the arrow. Insert four size AA alkaline cells of 1.5 volts each
(never any other voltage). Check correct polarity as marked in the battery compartment. Slide in lid and close it.
Changing batteries: If the ready light (3) takes more than 40 seconds to light up, the batteries are spent and need
replacement. Always replace them as a complete set. To avoid corrosion damage never leave spent batteries in the flash
unit.
Camera mounting: Place the flash unit vertically on the camera and push the foot into the accessory shoe. If the latter is a
hot shoe, this directly connects the flash unit to the camera. With cameras equipped with a normal PC socket, plug the
synchronizing lead info the synchronizing socket (4) of the flash unit and the other end of the lead info the PC socket on
the camera. On cameras with adjustable synchronization, set the latter always to X. Check usable shutter speed for flash
from the camera instructions (usually this is 1/60 second). Expose at the fastest usable speed for flash.
The Vario-Computer
1. Select the aperture
Set the film speed on the Aperture slide. To the left of the four arrow-heads (CTX 740) or three arrow-heads (736 CX) you
then read off the available working apertures. Choose these according to whether you need a greater flash range or
extended depth of field. Set this aperture on the camera.
2. a) Setting the Computer — 740 CTX
Set the computer selector switch as required. A distance signal lights up underneath the selected aperture. This indicates
the maximum distance range for the setting being used. The following five settings are available:
I = Smallest aperture, hence greatest depth of field. Flash distance range 0.5 to 3.3 metres (20 inches to 10 feet)
II = Next larger aperture, with slightly reduced depth of field. Distance range is now 0.5 to 4.5 metres (20 inches to 15
feet)
III = Aperture opened by two further stops, yields extended flash range from 0.9 to 10 metres (40 inches to 33 feet) IV —
Largest aperture, minimum depth of field; greatest flash range from 1.5 to 14 metres (60 inches to 46 feet)
M = Manual setting — see section on manual Operation.
2. b) Setting the Computer — 736 CX
The instruction in section 2 a) apply similarly to the model 736 CX. This however has no luminous distance range
indication and a choice of only three apertures:
I = Small aperture, great depth of field; flash range 0 to 4 metres (20 inches to 13 feet)
II = Next larger aperture, with slightly reduced depth of field. Distance range 0.5 to 6 metres (20 inches to 20 feet)
III = Large aperture, reduced depth of field; greater flash range from 0.5 to 8 metres (20 inches to 26 feet)
3. Computer check — 740 CTX
Provided free to www.orphancameras.com
