Blackmagic Ursa Mini B4 Mount - Blackmagic Design URSA Mini Manual De Instalación Y Funcionamiento

Blackmagic URSA Mini B4 Mount

The PL mount on Blackmagic URSA Mini PL can be removed and replaced with an optional
B4 mount. This mount differs slightly to the B4 mount on URSA Mini Pro. For example, the screw
holes are in a different position to allow for the EF button release housing on URSA Mini Pro.
The shim thicknesses required are also different, so if you want to use B4 lenses with your
URSA Mini PL it's important you choose the correct mount.
The B4 mount for URSA Mini PL can be purchased from Blackmagic Design resellers.
Using the B4 mount, you can shoot ENG style HD coverage with URSA Mini PL using common
par-focal zoom lenses. Par-focal lenses provide constant focus throughout the zoom range for
quick and efficient focussing techniques. By zooming into maximum telephoto and setting focus
on a target, you can be sure your focus will stay set to that target all the way from maximum
zoom to maximum wide. It's important to note that the B4 lens back focus, or flange focal
distance, also needs to be correctly set.
Attaching the B4 Lens Mount
The B4 mount is supplied with two additional 0.50mm shims designed to be installed together
with the existing 0.50mm shim already mounted behind your URSA Mini PL lens mount. This will
give you a total of three 0.50mm shims to provide the clearance needed so you can achieve
the optimum back focus, which can be refined further by adjusting the back focus ring at the
mount end of B4 zoom lenses.
Using B4 lenses, you can achieve a greater variety of shots with your URSA Mini that are
impossible to get using stills lenses.
To connect your URSA Mini B4 lens mount you'll need a torque wrench able to accurately set
a maximum torque of 0.45Nm, plus a 2.0mm Hex key driver.
To attach the Blackmagic URSA Mini B4 Mount, you will need a torque wrench able to
accurately set a maximum torque of 0.45Nm, together with a 2.0mm Hex key driver
1
Place Blackmagic URSA Mini PL on a solid, clean
bench top and remove your lens or dust cap. The
glass filter covering the sensor will be exposed
for the duration of the shimming process, so it's
important to keep the filter as clean as possible.
Be careful not to touch the filter while attaching
the B4 mount.
2
Remove the six PL mount screws using
the 2.0mm Hex driver. You may need to
occasionally rotate the PL locking ring
clockwise or counterclockwise to access the
screws.
Blackmagic URSA Mini B4 Mount 279