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Condensation
When moving the camera from a cool to a warm
location or when the camera is used in a damp climate,
condensation may form inside the lens compartment, on
the sensor cover glass and on the electrical connections.
Operating the camera in this state may cause a
failure or even permanent damage.
To reduce the risk of condensation:
Attach the included
•
air-drying cartridge to the
PL-Mount of the camera when the camera is
stored in an environment that is cooler than
the location the camera will be used at.
In ambient temperatures above 30 °C/86 °F and/
•
or humidity above 60%, always attach the drying
cartridge to the PL-Mount of the camera, whenever the
camera is not used. This not only applies to storage, but
also to shooting breaks and situations when the camera
remains without a lens attached for an extended time.
When the ARRIFLEX D-21 is transported or stored
inside a transport case, the air-drying cartridge has
to be removed.
Pixel Failure
ARRI Imaging Technology (AIT) inside the D-21 & D-21
HD provides an automated Defect Pixel Correction
(DPC), which instantly identifies a pixel failure and
corrects it with information gathered from the
surrounding pixels. This correction is not visible as the
number of dead/defective pixels typically accounts
for a very small fraction of the total pixel count.
The probability of a cluster of adjacent pixels
failing is very low in comparison to a single pixel
becoming defective. DPC corrects failing pixel
clusters based on a dead/defective pixel map.
Checking for Pixel Failure Clusters
Despite the low probability of its occurrence,
it is recommended to check for cluster pixel
failures at the end of each shooting day or prior
to shooting. A cluster of defective/dead pixels is
relatively easy to spot in the output image.
Defective pixels deliver improper luminance
values causing bright red, green or
blue spots in the output image.
Dead pixels deliver no signal at all causing dark spots or
spots with a green or cyan color cast in the output image.