For the shooting, TTL Flash exposure compensation is available by 2 ways:
-
Use “+/-Ev” dial on the underwater strobe body (adjustment works for fiber-optical type connection only).
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Use camera “Flash Exposure Compensation” function. Such adjustment is recommended, it is more deep, works for
both types of connection. Available
“Flash Exposure Compensation” range for Canon cameras: -3ev…0...+3ev. User
can adjust it by steps 0.3ev or 0.5ev (choose the step by camera menu), viewing the value on the camera menu scale.
The same adjustment is avalable by camera wheel, looking to camera service screen scale.
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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 camera can
be positioned as close to the target as user needs.
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TTL-Converter is tuned for normal TTL accuracy under water. Land tests may give another results.
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In some shooting conditions or camera settings, TTL system may be not effective or
out of working range.
This case
photographer should use Manual modes.
Shooting in Manual mode
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Underwater photographer can use 3 different ways to shoot in Manual mode:
-
Camera menu Manual mode
-
Underwater strobe Manual mode
-
TTL-Converter hardwire Manual mode
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Camera menu Manual Mode (controlled M mode)
Switch system to Manual mode by camera menu.
Set underwater strobe to S-TTL (TTL) mode for availability of flash output adjustment via camera controls.
This is preferable Manual mode for universal usage, easy switchable and controllable under water during the diving.
This case TTL-Converter also switches to appropriate M mode automatically by camera command.
In such Manual mode also becomes available flash output level scale in submenu. User can adjust flash output level
by camera wheel, looking to this menu scale (or looking to camera service screen):
Some manual underwater strobes (like MF-1) requires very strong optical signal for synchronization, this case necessary to
set maximum power by this scale (1/1).
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Underwater Strobe Manual Mode:
Set underwater strobe to M mode without pre-flashes. Adjust strobe light intensity by the dial switch on the
strobe body.
Recommended settings in camera menu:
“M” mode, flash output level “1/1”.
For information: If camera is in
“M” mode by menu, - all Pre-flashes in system are disabled.
If user needs to get full dump from underwater strobe, -
set “FULL” on the strobe body, set camera menu to “M” mode
and flash output level “1/1” by camera menu.
