Instruction manual

149
Operation
The frame rate of the new generation of ARRIFLEX cameras
can be changed with the following accessories: RU-1 (Remote
Unit), RCU-1 (Remote Control Unit) and CCU-1 (Camera
Control Unit).
Since each frame’s exposure time is dependent on the
camera’s frame rate, the mirror shutter setting and the
aperture setting on the lens, a change in the camera’s
frame rate results in a change of the exposure.
ARRI currently provides two methods to compensate for
this change in exposure:
• The ARRICAMs, ARRIFLEX 435 Xtreme/Advanced, 435 ES
and 535 are equipped with an electronic shutter that
can change its open shutter angle on the fly to compen-
sate for the change in exposure during a speed ramp. The
RCU-1 or the WRC-1 are needed to create such speed/
shutter ramps. There is no visible change in the depth
of field in the picture with this kind of exposure
compensation.
• The ICU-1 (Iris Control Unit) can change the lens iris
on the fly to compensate for the change in exposure
during a speed ramp even on cameras that are not
equipped with an electronically adjustable mirror
shutter.
With the ICU, speed ramps can be performed on the
following cameras: ARRICAM ST and LT, ARRIFLEX
435 Xtreme/Advanced, 435ES, 435, 535, 535B, 35 III,
16SR I, 16SR II, 16SR II HS, 16SR 3 / Advanced,
16SR 3 HS /Advanced, 765.