User`s guide

ARRICAM Accessories Quick Guide 01/2004, Page 10 of 24
The Speed Control Box on its own performs automatic speed/shutter or speed/iris ramps. When the Speed
Control Box is used together with the Manual Control Box, manually controlled speed ramps as well as shutter/
iris (depth of field/motion blur) ramps become possible.
The REMOTE LED on the Speed Control Box glows green when both these accessories work in combination.
When the MANUAL CONTROL switch on the Manual Control Box is set to SHUTTER (
) or FPS, these
functions on the Speed Control Box are overridden.
Note: For all the following ramp types the RAMP button and TIME selector on the Speed Control Box have no
effect, since the Manual Control Box controls the ramp.
Manual speed/shutter ramps.
• On the Manual Control Box set the MANUAL CONTROL switch to FPS.
• On the Speed Control Box set the SPEED CONTROL switch to ON.
• On the Speed Control Box set the COMPENSATION switch to SHUTTER.
• On the Speed Control Box enter the start and end frame rates of the ramp with the FPS 1 and FPS 2
selectors. These values define the limits of the MCB handwheel.
• Set the ramp’s starting fps with the Manual Control Box handwheel.
• Once the COMPENSATION LED is green, start the camera. Turn the Manual Control Box handwheel to
perform the ramp.
Note: The camera will automatically pair the highest frame rate with a 180° shutter angle, and calculate all other
shutter angles based on the resulting exposure time. If the FPS 1 or FPS 2 LED flash red, the fps value entered is too
high or too low. If the COMPENSATION LED glows red, the shutter cannot compensate for the fps range entered.
Try reducing the fps range.
Manual speed/iris ramps with LDS lenses
To compensate a speed ramp with the iris, these additional components are required: the Lens Data Box (LDB),
an LDS Lens and a CLM motor.
In performing a speed ramp with iris compensation, the iris can only be set with the OPEN/CLOSE buttons on
the SCB – the Wireless Focus Unit iris remote control is overridden.
• On the Manual Control Box set the MANUAL CONTROL switch to FPS.
• On the Speed Control Box set the SPEED CONTROL switch to ON and the COMPENSATION switch to IRIS.
• The CALIBRATION LED on the Speed Control Box now flashes yellow if the motor is not calibrated. In that
case, press the CAL button on the Speed Control Box to calibrate the iris motor.
• On the Speed Control Box enter the highest and lowest frame rates of the ramp with the FPS 1 and FPS 2
selectors. These values define the limits of the Manual Control Box handwheel.
• Use the Manual Control Box handwheel to find an fps setting that makes it easy to work out what T-stop
should be on the lens. e.g. 24fps; your normal shooting stop, 48fps; open by 1 stop over normal.
• At this handwheel setting, use the OPEN and CLOSE buttons on the Speed Control Box to set the T-stop.
• Set the ramp’s starting frame rate with the Manual Control Box handwheel.
• Once the COMPENSATION LED is green, start the camera. Turn the Manual Control Box handwheel to
perform the ramp.
Note: If the FPS 1 or FPS 2 LED flashes red, the fps value entered is too high or too low. If the COMPENSATION
LED glows red, the iris cannot compensate for the preset fps range. Try to change on the Speed Control Box either
the selected iris with the OPEN and CLOSE buttons or the fps range.
Combined use of the Manual & Speed Control Boxes