ARRI ALEXA User Manual page 20

20
When moving the camera from a cool to a warm location or when the
camera is used in a damp environment, condensation may form inside the
lens compartment, on the sensor cover glass, between sensor and its cover
glass, and on internal or external electrical connections.

Operating the camera in these conditions may result in personal injury
or damage to the equipment!
Condensation on the optical components may have a visible effect on the
output images. To reduce the risk of condensation:

Find a warmer storage location.

Attach the ARRI air-drying cartridge (silica bottle) to the PL-Mount of
the camera during storage (NOT during transport!)

If camera needs to be stored in a place that is considerably cooler
than the location where it will be used, consider keeping the camera
powered from a mains unit in addition to using the air-drying cartridge.

In ambient temperatures above 30°C/86°F and/or humidity above
60%, always attach the air-drying cartridge to the PL-Mount of the
camera when not in use. This not only applies to storage, but also to
shooting breaks and situations when the camera remains without an
attached lens for an extended time.

MAKE SURE THE SILICA BOTTLE IS SECURELY FASTENED.
UNDER NO CIRCUMSTANCES SPILL SILICA INTO THE LENS
COMPARTMENT!
General Precautions