Focus Control; Focus Step Size And Live View On/Off - Okii Systems USB Focus Controller User Manual

Controller Functions: Focus Control
The focus can be adjusted by using the center knob or the two directional focus buttons when
live view is turned on. By default, turning the knob clockwise will cause the focus to move closer.
Turning the knob counter-clockwise will cause the focus to move towards infinity. This matches
the focus ring rotation of Canon EF and EF-S lenses. It is also possible to reverse the knob, which
is described in the Switch Test and Reversing Knob Direction section of this manual.
If a continuous focus transition is desired, use either of the directional focus buttons. Pressing
and holding either one will cause the focus to continually move toward the minimum focus
distance or infinity.
Important:
1. The maximum speed at which focus commands are sent is governed by the focus command
send rate. If the focus command send rate is set too fast, some focus change commands will be
dropped, and the focus movement may be erratic. If this occurs, slow down the focus command
send rate slightly, then try again.
2. Each lens model may require different focus command send rates for optimal performance.
The focus step size in use will also have an impact: Large steps will take longer for the lens to
move the focus because it has to turn further, so the rate must be slowed down.
To adjust the focus command send rate, refer to the Changing the Focus Command Send
Rate section of this manual.
Warning: Continuing to hold a directional focus button or turning the focus knob after a lens has
reached the end of its focus range may cause excessive wear on the autofocus motor. To prevent
this, use the near and infinity focus stops, which will prevent additional focus commands from
being sent once the focus reaches the saved positions. More details about using the focus stops
can be found in the Controller Functions: Focus Points section of this manual.
Controller Functions: Focus Step Size and Live View On/Off
Canon's USB implementation allows for three different step sizes when sending
a focus command to the camera. A short press of the focus step button cycles through the three
different sizes. The LED will blink white one, two, or three times to indicate the small, medium,
and large step sizes.
Changing the step size will have an effect on how long it takes the lens to complete each focus
move, so the focus command send rate must be set appropriately. Do not change the step size
after focus points have been saved, or you will lose your focus point accuracy.
Holding the focus step button will toggle the live view display on or off.
Note: The 7D and 500D/T1i/Kiss X3 ignore live view "on" commands while in video recording
mode.
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