Aluminum Focus Marking Ring
FOR PRESTON HU3/HU4, ARRI WCU-4, & ARRI SXU-1 HANDUNITS
This is a blank aluminum focus marking ring for the Preston HU3 handset. It also fits Arri WCU-4 and SXU-1 handsets. If you’ve ever had a problem with the white plastic Delrin rings being near-impossible to put on or remove from the handset when it’s cold out, it’s because Delrin has a higher coefficient of thermal expansion than aluminum—it shrinks in the cold more than the metal HU3 knob.
These marking rings are machined aluminum in a natural silver colour with a matte finish (clear anodized) or in black anodized finish.
The silver finish rings are ideal if you like to write your own marks with a Sharpie marker; they wipe clean with Pancro or alcohol. The black anodized finish look great paired with Preston’s yellow pre-marked lens mapping labels, making these a perfect replacement for the stock Preston rings.
