Focus Points - Okii Systems USB Focus Controller User Manual

Controller Functions: Focus Points
When focus point mode is active (green LED), the multi-function buttons 6 – 9 are used to save,
clear, and return to four focus points. Two of these are dynamic, while the other two act as focus
stops and will not allow the focus to travel past them:
Button 9: Infinity focus stop
Button 8: Dynamic focus point
Button 7: Dynamic focus point
Button 6: Near focus stop
Saved focus points are not retained through a power cycle of the FC1 USB Focus Controller, but
they will be saved if the camera is disconnected or turned off while the controller remains on.
A short press causes the LED to blink yellow and the focus to travel to a saved focus point. If
there is no saved point assigned to the button, nothing will happen.
If no focus point is assigned to a button, a long press will save the current focus position and
blink the LED purple. A second long press on the same button will clear the focus point and blink
the LED red.
Once a focus position is saved with either of the focus stop buttons, the focus will not travel past
the saved points. The infinity focus stop prevents the focus from traveling further towards
infinity, while the near focus stop prevents the focus from traveling any closer. If either of the
dynamic focus points store locations outside the bounds of the infinity and near focus stops, they
will automatically be cleared.
The two dynamic focus points do not prevent the focus from traveling past them in either
direction.
Focus points can only be saved or cleared when live view is turned on and you are not recording
video.
Important: The focus points are saved on a command count basis, i.e., the controller knows the
location of each saved position based on the number of commands it takes to reach them. If the
focus command send rate is set too fast, commands will be dropped, and your saved focus points
will not be accurate. Additionally, if you do not set the infinity and near focus stops and continue
to turn the focus knob or hold the directional focus buttons after the focus reaches either end of
the focus range, your saved focus points will no longer work.
Important: The use of the focus stops is significant — the controller will maintain the correct
count and accuracy, even if you continue to turn the focus knob or hold a directional focus
button after the focus has reached either stop. The controller will indicate a focus stop has been
reached by blinking the LED yellow as long as focus commands continue to be sent.
Important: Some lenses suffer from focus point shift. For example, each increment towards
infinity focus may rotate the focus ring 15 degrees, while each increment towards near focus may
rotate the focus ring 10 degrees. This difference makes it all but impossible to use focus points
reliably. Only some lenses suffer from this attribute, so test for this by saving two focus points
and repeatedly transitioning between them.
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