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Shimming Lens Mounts
What is a Shim?
Shims are thin disks of varying thickness that let you make fine adjustments to the distance
between your lens and URSA Mini's sensor. This distance is commonly known as the flange
focal distance, or back focus, and can change slightly due to variables such as lens age and the
environmental conditions of your shoot. The following URSA Mini models are designed so you
can easily adjust back focus using shims.
‚ URSA Mini PL 4K
‚ URSA Mini PL 4.6K
‚ URSA Mini Pro 4.6K
‚ URSA Mini Pro 4.6K G2
URSA Mini Shim
Shims are placed between the lens mount and the camera body so the distance from your
subject to the sensor matches the focus marks on your lens. These are most commonly used
for PL lenses. These cine lenses are manually focused and have very accurate focal distance
markings on their barrels. Shims are also used for URSA Mini Pro's interchangeable lens mount.
Your Blackmagic URSA Mini is supplied with a 0.50mm shim already installed. The Blackmagic
URSA Mini Pro Shim Kit contains additional shim sets of various thicknesses, and can be
purchased from your local Blackmagic Design reseller. A set of shims is also included with
all mount kits for URSA Mini Pro. Use shim thicknesses depending on your back focus
requirements.
Shimming URSA Mini PL
To shim your camera's PL mount you'll need a torque wrench able to accurately set a maximum
torque of 0.45Nm, with a 2.0mm Hex key and driver.
Torque wrench
URSA Mini Pro Shim
Shimming Lens Mounts
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