User's Manual

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 the your lenses’ aperture ring.
Auto
Set this switch to ‘auto’ or ‘a’ to adjust your lens aperture via your URSA Broadcast or an
ATEM switcher. You can adjust lens aperture from URSA Broadcast using the iris wheel,
internal control panel buttons, touchscreen controls, or iris based auto exposure
modes. See the ‘URSA Broadcast 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 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’s
LCDtouchscreen. 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.
11Using Servo Zoom Lenses