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 Cine’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. URSA Cine is designed so you can easily adjust back
focus using shims.
URSA Cine 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. This is most critical when using
cine lenses which are manually focused and have very accurate focal distance markings on
their barrels.
Your Blackmagic URSA Cine is supplied with its captive camera body and lens mount shims
already precisely shimmed. If you wish to change this for any particular lens mount, Blackmagic
Ursa Cine Mount Shims contains additional shim sets of various thicknesses and can be
purchased from your local Blackmagic Design reseller. Use shim thicknesses depending on
your back focus requirements.
See the ‘interchangeable lens mount’ section for more information on attaching lens mounts to
URSA Cine.
174Shimming Lens Mounts
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