OConnor C1243-0001 User Manual - page 14
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Insert the front of the donut into the
clamping interface and push in as far
as the tooth profile. Turn the knurled
screw clockwise, until it firmly holds
the donut in the interface.
Insert the reduction ring into the donut
thread, then turn clockwise to fix in
position. Finally, using the LWS rod
bracket mount the assembled mattebox
on the camera rods and push until it
engages with the camera lens.
The O-Box WM can be fitted with an optional bellows ring
or “donut” and a reduction ring for use with camera lenses
with smaller lens diameters (see page 9). The donut can
accommodate an optional rotatable round filter (Ø138 mm).
This configuration is suitable for camera rods.
Slacken the large knurled screw on the
rear clamping interface a few turns to
widen the clamping ring. If a round filter
is used, unscrew the retaining ring at the
front of the donut, insert the filter in the
ring groove, then reassemble the donut.
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assembling the bellows ring (donut)