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Lens Mounting 47
11 Lens Mounting
The ALEXA is equipped with an interchangeable lens mount.
NOTICE
Lenses must cover an image circle of at least 27.3 mm for 16:9 sensor mode, 29.7
mm for 4:3 sensor mode and 33.5 mm for Open Gate sensor mode to prevent
vignetting.
11.1 Lens Adapter PL-Mount LA-PL-2
The ALEXA lens mount supports the ARRI Lens Data System. An LDS lens must
be mounted in the 12 o'clock or 3 o'clock position to enable the LDS functions. Take
care not to damage the LDS contacts on the lens and the camera when mounting or
unmounting a lens or lens port cover.
The LA-PL-2 also offers basic Cooke /i support for direct lens metadata capture
through the LDS contacts. The cameras can store a subset of lens data (focus
distance and lens iris settings) as dynamic camera metadata. Running the camera
outside the standard speeds of 23.976 to 30 fps may produce an offset of several
frames. Certain lens settings will produce an offset lens data readout (e. g. iris open).
This can be corrected manually, after the metadata had been extracted (ARRI Meta
Extract).
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.
To mount a PL-mount lens:
1. Turn the bayonet ring anti-clockwise until it stops.
2. Remove the lens port cap.
3. Carefully insert the lens into the lens port. Align the notch in the lens flange with
the index pin on the mount, keeping the lens rotated into a position where the lens
markings are visible from either side of the camera.
4. Press the lens flange flat onto the lens mount.
5. Turn the bayonet ring clockwise until the lens is locked securely.
6. Ensure that the lens is properly mounted.
NOTICE
•
When no lens is attached to the camera, use the lens port cap to prevent dust
from entering the lens cavity.
•
The sophisticated design principle of the camera’s optical module delivers
outstanding images with a cinematic look and feel, but also makes the imager
sensitive to contamination. Dust particles that have settled on the sensor cover
glass during a lens change may become visible as dark spots in the output
image, similar to lint leaving marks on exposed film. The degree of this effect
depends on the aperture of the lens.
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