Subtronic Nova, User Manual

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MANUAL FLASH GUN OPERATION

If you operate your flash gun in manual mode, the configured power rating is already
used for the preflash. This means that the main flash cannot usually be ignited. Camera
models on which the preflash cannot be disabled are not suitable for manual operation
(Olympus models).
Please consult your camera’s user guide to see whether it is capable of controlling a flash
gun in manual mode. This is not a problem with CANON and NIKON models equipped with
a
nova
featuring a +/- switch with the M setting. The flash gun emits a constant light
source according to the selector switch setting (1/1 to 1/32 ). These sub-functions are
electronically governed and are therefore always identical. The preflash is suppressed.
A suitable aperture setting for your camera can be calculated using this formula:
GUIDE NUMBER
APERTURE =
DISTANCE
 This formula only applies to distances greater than 1 meter under water.
The flash gun performs at full power with the manual setting “ 1/1 ”. The performance switch
can be adjusted by one aperture setting respectively. The power output of the flash gun
can therefore be reduced by a maximum of 4 aperture settings. This allows you to find the
appropriate apertures for composite light and close-up shots.
By turning the rotary switch to 1/1 the flash’s power output is at its maximum. The output of
the flash can be reduced up to 4 aperture steps to a maximum. Here you can find the
aperture value for close-ups and mixed-light-shots.
Example: Distance 1 m (with reference to 21 DIN/100 ASA, clear water)
Right selector switch Camera aperture
1/1 16
1/2 11
1/4 8
1/8 5.6
1/16 4
1/32 2.8
Note: Due to the greater angle of illumination above water, readings taken on land
using a flash meter are around one aperture setting higher than the values given
above for under water.
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