B4 lens controls
Iris
On the top of most B4 handgrips, you’ll find an ‘auto/manual’ or ‘A/M’ switch, and a ‘push auto’
or ‘iris’ switch. These control your lenses’ aperture ring.
Auto
Set this switch to ‘auto’ or ‘a’ to adjust your lens aperture via your URSA Broadcast G2,
Blackmagic Zoom Demand or an ATEM switcher. You can adjust lens aperture from URSA
Broadcast G2 using the iris wheel, internal control panel buttons, touchscreen controls,
or iris based auto exposure modes. See the ‘URSA Broadcast G2 controls’ and ‘touchscreen
controls’ sections in this manual for more details. While in ‘auto’ mode, the aperture ring on
your B4 lens cannot be moved manually.
Manual
Set this switch to ‘manual’ or ‘m’ to adjust your lens aperture by turning the iris ring on the lens
barrel. In this mode, your lens will not accept aperture commands from your URSA Broadcast
G2 or ATEM switcher.
Push Auto/Iris
Use this button to momentarily activate ‘auto’ aperture control while in ‘manual’ mode. This can
be combined with iris controls on your camera or ATEM switcher to great effect.
For example, with your camera set to an iris based auto exposure mode and your lens aperture
set to ‘manual,’ you can freely adjust your lens iris by using the aperture ring on the lens barrel,
however tapping the ‘push auto’/‘iris’ button will momentarily activate auto exposure, adjusting
your iris for the current lighting conditions.
Alternatively, you can set an iris value using the controls on your URSA Broadcast G2’s
LCDtouchscreen. While in ‘manual’ mode, you are free to adjust lens aperture using the
aperture ring on the lens barrel, but tapping the ‘push auto’/‘iris’ button will return the lens
to the preset value on your touchscreen.
12Using Servo Zoom Lenses
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