Zeiss Ventum 28/21 Manuel D'utilisation page 8

Lens components
1 Internal thread for attaching a filter
2 Aperture ring for setting the aperture stop manually
3 Lens mount (E-mount)
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Handling
Rear protection cover
The rear protection cover is detached by turning the lens counter-
clockwise, and is attached by turning it clockwise.
Front protection cover
The front protection cover is detached and attached by
simultaneously pressing both buttons at the edge of the cover
or by inserting your fingertips into the recesses.
Mounting the lens
The lens has an E-mount threaded connection (3). Align the blue
marking on the rear lens ring with the marking on the camera
housing, then insert the lens in the camera mount. Turn the lens
clockwise until it engages audibly and visibly.
Removing the lens
Press and hold down the lens release button on the camera, turn
the lens counter-clockwise and lift it out of the camera mount.
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