VARIZOOM VZ-EFC2 User Manual
VZ-EFC2 Electronic Focus or Iris
Control for Canon/Fujinon
Included in the kit: 1) Hand Control Unit 2) Motor/Bracket 3) Canon BP-915 type Battery & Charger
4) 20’ extension cable 5) 3 drive gears - Canon 0.5M, Fujinon 0.6M, Iris 64DP 6) Carrying pouch
Setting up the Motor Bracket
There are 3 drive gears included – 1 for Canon focus ring, 1 for Fujinon focus ring, 1 for iris ring of
either type. You merely need to select the correct black drive gear by checking the teeth against the
lens ring. Based on these factors, attach the appropriate black drive gear to the motor spindle. It may
be a tight fit initially, but once it’s started you can use the fixing screw and washer to help press the
gear into place.
The motor bracket should attach to directly to your lens. It comes set
up for standard size lenses. If you have a small-diameter lens for a
1/3” sensor camera, you may have to reverse the attachment arm to
engage on the smaller-radius side. Try mounting the bracket first
and if it engages tightly without moving, you don’t need to flip the
bracket. Set the position of the motor-gear relative to the gear ring
on the lens, but leave the gears disengaged for now.
Also note that you can detach the motor from the bracket and flip its
position on the bracket, or simply flip the entire bracket around, if
needed. There are several ways to configure and attach the bracket
system – it was designed to be flexible to work with your needs.
You’ll set up the hand unit next. To do this, you need to be able to
rotate the lens by hand and move the motor without moving the lens,
so leave a gap between the motor gear and lens ring for now.
Setting up the Hand Unit and Calibrating the Motor
Install the battery on the hand unit and flip the power switch, if necessary. Connect the hand unit to
the motor using the supplied extension cord. Turn the focus knob and take note of the direction it
turns the motor. Press and hold “Menu” until “Set-up Menu” appears on the display. The first option is
“F-Rotate,” which simply allows you to change the direction the motor moves in relation to the focus
knob. If you’re happy with the way it moves and don’t want to change, hit “Select” and you’ll see “IRotate” (on older units “Z-Rotate”) – this is not used, so skip it by hitting “Select” again. The
display readout should now say “Focus to minimum.”
Now you’re at the point of calibrating the hand unit and motor response. The motor has fixed limits to
its range of motion, so what you want to do is fit the lens rotation within those limits. Following the
menu prompt, turn the focus knob all the way to the “minimum,” meaning in the direction that makes
the number in the display decrease to “500.” (On Older Units only: You’ll notice that when the knob is
turned all the way and the number approaches zero, the motor does not respond. You want to set the
knob to a point where the motor is actually responding smoothly to input from the focus knob, usually
about “500”).
Now, by hand, turn the ring on your lens to a point close to the end of its range in the same direction
the motor would be moving it as it goes toward “minimum.” Turn the focus knob very slightly in the
opposite direction (toward “maximum”) so that it still has range of motion to drive the lens all the way
back to minimum. Now engage the motor gear to the lens ring and tighten the bracket clamp on the
rod. Using the focus knob, make sure you can drive the lens to its minimum, without overdriving or
flexing anything, then “Press 1 to Save” the minimum.
That was the hard part. Now you simply need to turn the focus knob toward maximum until it reaches
the end of the lens range, without overdriving or flexing anything, and “Press 1 to Save” the
maximum.
Next will appear another setup item “Iris – Press 1” (on older units “Zoom – Press 1”) – skip this step
by pressing “Select”. If you accidentally hit 1 here, it will lock you into the menu - to clear it, switch
the hand unit power off and on, and don’t worry, your focus calibration has already been stored.
Note that the hand unit will save this focus range, but it is relative to the position of the lens, so if you
disassemble the setup, you’ll at least have to reset the motor and lens positions to match.
Operating the EFC2U and Saving Focus Presets
Once calibrated, the readout will show a range from 0 to 999. This numerical value indexes the
electromechanical ranges of the knob and motor, and it should be repeatable to a pretty accurate
degree. So, for example, if you change focus from 220 to 430 and nothing in your scene has moved
and the lens position hasn’t moved, you should be able to accurately repeat that focal change
referencing only those numbers.
Because of this indexing, you also have the ability to store focal presets using buttons 1-5. To save a
preset, simply focus on a subject and hold the desired button (1-5) until the readout says “Saved F_.”
With these presets you can quickly jump between 5 subjects without having to visually focus using
the knob. Of course, if any of the subjects move or the camera moves, the focus will be off.