Mode Switch; Off Position; Ttl/Auto Exposure Position; Manual Exposure Position - Ikelite DS51 Instructions Manual

MODE SWIT C H
The DS51 Strobe mode switch has eight different positions: OFF, TTL/auto exposure
setting, and six manual exposure settings. Refer to illustrations on page 16.
OFF POSITION (Refer to illustrations on page 16)
(Fig.1) Shows the mode switch in the OFF position. The white indicator on the knob
aligns with OFF. Always turn the strobe to OFF before connecting or disconnecting a sync
cord or opening the battery compartment.
TTL/AUTO EXPOSURE POSITION (Refer to illustrations on page 16)
(Fig.2) Shows the mode switch in the TTL (Thru-the-Lens) / auto exposure position. From
the OFF position, rotate the switch clockwise to access the TTL/auto exposure setting; the
white indicator on the knob aligns with TTL. When taking pictures with the mode switch in
this position, the camera automatically signals the strobe to turn off
when the exposure is correct.
- When the DS51 is connected directly to the camera, the camera must feature
compatible TTL/auto exposure to utilize this mode.
- The TTL/auto firing mode must be selected when connecting the EV Manual
Controller #4100.6 (page 10).
MANUAL EXPOSURE POSITION (Refer to illustrations on page 16)
Figure 3 shows the mode switch in the manual exposure mode with the DS51 Strobe
turned to the F (full power) position. Rotate the mode switch clockwise to access the
different power settings. Each power setting clockwise from F reduces the light output of
the DS51 Strobe in one-half f-stop increments. When shooting in the manual mode, it is
suggested that you start the strobe at full power and adjust the camera's aperture based
on the strobe-to-subject distance.
If the subject in the photo is underexposed (dark) you must move closer to the subject. If
the subject is overexposed (light), then you can rotate the mode switch clockwise to
reduce the light output of the strobe until the desired exposure is obtained. The DS51
provides five reductions in power in one-half f-stop increments from the full power setting.
(Fig.4), for example, shows the mode switch set to -1 and 1/2 f-stops.
Do not use manual strobe settings with a camera that emits "pre-flash." Leave the
DS51 in the TTL position and adjust exposure using your camera settings or
housing conversion circuitry (if applicable).
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