10 Lens Mounting
The ALEXA is equipped with an interchangeable lens mount.
Note: 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 33.6 mm for Open Gate sensor mode
to prevent vignetting.
10.1 Lens Adapter PL Mount LA-PL-1
(no LDS)
The Lens Adapter LA-PL-1 is the standard lens mount delivered with the
ALEXA. It can be used to attach any modern PL-mount lens to the
camera.
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.
Note: When no lens is attached to the camera, use the lens port cap to prevent
dust from entering the lens cavity.
Note: 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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