Instruction manual

ARRI WCU-4 User Manual22

Sub-Menu PREMARKED FOCUS RING

For mapping the focus scale of ARRI LDS lenses or other lenses, represented in the

ARRI Lens Data Archive, a set of replaceable pre-marked focus rings is available.

For lenses not yet represented in the Lens Data Archive (LDA) a blank focus ring

may be used.

Select a focus ring with a lower value, but next to the nearest distance shown on

the lens scale.

Example: Lowest focus distance on the lens: 0.8 m

Available focus rings: 0.25 m, 0.35 m, 0.5 m, 1 m (12”,14”, 20”,36”)

Best ﬁ t: Focus ring with 0.5 m

- Select the lens from the ALEXA LDA menu.

- Select the focus ring from the WCU-4 menu.

- The focus lens scale on the WCU-4 will now map to the lens on the camera.

UP or

DOWN Select the attached focus ring.

SET Conﬁ rm the selection.

Note:

The displayed focus unit (metric - imperial) depends on the camera setting or LDS lens type.

Sub-Menu LENS DATA

The circle of confusion for correct calculation of depth of ﬁ eld can be set in this

menu.

UP or

DOWN Select the preferred circle of confusion.

SET Conﬁ rm the selection.