Shooting in TTL mode
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Set main dial switch on the underwater strobe body to TTL mode. Please refer to strobe
’s User Manual to choose
appropriate mode (Z330, Z240 set to “S-TTL”, YS-D1/D2 set to “DS-TTL”, YS-250/DS-161/DS160 set to “TTL”).
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Set the dial (+/-Ev correction) on the underwater
strobe body to “0 ev” position, as initial setting.
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Using Z240 / Z330 strobe, pay attention:
1) Pre-
flash control magnet must be in “Push” (down) position and locked by rotation.
2) Using optical synchronization, set right dial switch on the strobe body
to “0ev” (position “12 o’clock”), but using
electrical wire synchronization set right
dial switch to “ttl” mark as fixed position (“9 o’clock”).
3) In case of optical synchronization, TTL correction (+/-) is available by the strobe dial switch
“+/-Ev” and also by the
camera controls via “Flash Exposure Compensation”. The final correction value is the sum of these two corrections.
Pay attention: In case of electric wire synchronization, the adjustment (+/-) by the strobe dial is unavailable on most of
underwater strobes, but still available by camera controls using
“Flash Exposure Compensation”.
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Connect TTL-Converter Hot Shoe plug to the camera Hot Shoe socket. Switch ON the camera. TTL-Converter activates
automatically (switch ON) when user pushes camera Shutter Release Button for shooting or focusing. Device goes to
standby mode (switch OFF) automatically a few seconds later (based on input from the camera), or after disconnection
from camera Hot Shoe socket.
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Camera recognizes Sony compatible TTL device on the Hot Shoe socket and confirms the compatibility by
the two “Flash”
symbols
on the service screen.
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In Flash Mode menu set “Fill-flash”, “Slow” sync, or “Rear curtain” sync, depending on the shooting tasks:
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Based on the concrete camera model and strobes quantity (a single strobe, a pair, or more) photographer should set any
initial (+/-) Flash Exposure Compensation for balanced flash lighting. Please make a land test of TTL work before
submerging.
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During the shooting underwater, photographer can use (+/-) Flash Exposure Compensation in wide range (-
3ev ….+3ev),
based on shooting conditions, subjects and tasks, if images are too bright or too dark.
In normal operation, TTL +/- Flash exposure compensation adjustment is available for underwater photographer through 2
methods:
-
Using “+/-Ev” dial switch on the underwater strobe body (adjustment works for fiber-optical type connection only).
-
Using camera “Flash Exposure Compensation” function. Such adjustment type is recommended as more accurate, and
it works for both types of connection (optical / electric). Available
“Flash Exposure Compensation” range for Sony
cameras: -
3ev…0...+3ev. User can adjust it in steps 0.3ev or 0.5ev (set the step by camera menu), viewing the value
on the camera menu scale.
▪
S
et only Mechanical Shutter type in camera menu. This is important for normal TTL work. Don’t use fully electronic shutter
(option available in some cameras menu). Only e-front curtain can be activated, if necessary.
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Shooting macro, for normal TTL accuracy the nearest distance from underwater strobe to a target must be more than
0.35m underwater (or more than 0.7m for the land tests),
to keep the system inside of working TTL range.
But the
camera can be positioned as close to the target as user requires so long as the strobe minimum distance is adjusted
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TTL-Converter is tuned for normal TTL accuracy under water. Land tests may give different results.
