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Ultra HD is also the default resolution for both ProRes and H.265 codecs. If you’d like to shoot
in HD that is also available in ProRes or H.264.
The record tab in the menu settings
TIP If you notice any vignetting in your images when using a B4 lens check that your
resolution is set to Ultra HD when set to Blackmagic RAW. If you are recording ProRes
or H.264/5, adjusting your camera’s ‘sensor area’ to 4K will suit the optical area that
the B4 mount covers. For more information, refer to the ‘record settings’ section later
in the 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 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.
11Using Servo Zoom Lenses
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