ARRI ALEXA Mini LF User Manual page 34

Lens Mounts and Lens Handling
ARRI Lens Data Archive (LDA)
Lenses without LDS can be integrated into the system via the Lens Data Archive (LDA). By mapping
a lens, all information about the lens, its scales, name, and serial number can be transferred into a
lens archive. When using the lens the next time all that has to be done is to load the lens file for that
lens from the Lens Data Archive and calibrate the motors. It takes about 5 minutes to map a lens: after
attaching the lens and connecting and calibrating motors (or Lens Data Encoders) on each axis of
the lens, the mapping can be done with the Wireless Compact Unit (WCU-4). These lens files can be
loaded to the camera.
Cooke /i
The LPL mount also offers basic Cooke /i support for direct lens metadata capture through the LDS
contacts. The cameras can store a subset of /i lens data (focus distance and iris settings) as dynamic
camera metadata. The basic /i compatibility has been tested and approved by Cooke Optics Limited.
For support and questions about /i Technology, please contact Cooke Optics directly.
The camera supports the Cooke /i protocol for lenses running firmware versions according to the
following table.
Lens type
S4 /i Prime lens (10-bit)
S4 /i Prime lens (12 bit)
S4 /i Zoom lens (10 bit)
S4 /i Zoom lens (12 bit)
The firmware version can be retrieved from the lens with the Cooke Viewer Lens Display program. For
detailed information, please contact Cooke Optics directly.
Lens Data Display in Camera
Lens data can be displayed as camera status overlays in the viewfinder and the SDI outputs. Single
overlays for focus distance, iris and focal length are displayed. The camera can be set to display
either metric or imperial readings for the focus distance overlay. For further information please see
page 76.
Lens Data in Metadata
Lens data is dynamically written to the metadata of MXF/Apple ProRes and MXF/ARRIRAW files and is
output in the SDI stream.
Metadata values include
Lens Model
Lens Serial Number
Lens Distance Unit
Lens Focus Distance
Lens Focal Length
Lens Iris
FW version
0.29 or higher
0.39 or higher
1.29 or higher
1.39 or higher
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