ARRI ALEXA 35 Body & PL Mount Set (LBUS) - Manual (Page 117)

Appendix 117
25.2 Sensor Related Information
Single Frame Spots of Various Shape – also known as “Digital Dust” or “White Flecks”
Natural and/or artificial radiation may cause a “false exposure” on the image sensor. The shape of
these spots may vary from dots to lines or other, sometimes irregular shapes. These spots occur in
random locations of the image, last only for a single frame and are more visible in dark images. This is
a principle issue of all image sensors and not a malfunction.
Flicker
Some light sources (i.e. discharge tubes or LEDs) may cause an interference with sensor exposure.
This may result in image flickering or “bands” of different brightness moving up or down the image.
Please note that at higher frame rates (100 fps in 50Hz countries, 120 fps in 60Hz countries) even
tungsten light may flicker. A short recording and playback will show this flicker.
Rolling Shutter
Due to the rolling shutter design principle of the sensor the following effects can be observed in certain
situations:
Skewed/slanted vertical lines: fast panning or fast-moving objects may result in vertical structures
to appear “skewed/slanted”. The intensity of the effect depends on the relative speed of panning/
object.
Partial exposure: very short light effects (i.e. a photographer’s flash or strobe light) may result in the
upper part of the image showing the light effect whereas the lower part does not or vice versa.
“Black Sun”
Very bright lights (i.e. the sun, or a photographer’s flash) may result in a black/magenta spot.
Stuck Pixels at Long Exposure Times
At longer exposure times (longer than the standard 1/50 th of a second), stuck pixels may become visible
in darker image areas. The longer the exposure time the more pixels will be affected. When using
exposure times longer than 1/24 th of a second, carefully check your image whether the quality meets
your requirements.
25.3 Companion Tools
ARRI maintains various tools to support your work with the ALEXA 35 on- and off-set.
ARRI Reference Tool
The ARRI Reference Tool (ART) combines the functionality of the ARRIRAW Converter, ARRI Color
Tool, and ARRI Meta Extract. It supports all ALEXA 35 recording formats and allows the creation of
ALF4 look files, conversion to SDR and HDR color spaces with looks applied, and export to Apple
ProRes, OpenEXR and TIFF files.
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ARRI Reference Tool
Camera Simulators
The camera simulator is an interactive learning tool to familiarize yourself with the menu navigation of
ARRI digital cameras. Get started now and learn first hand the simple, straightforward menu system
that only ARRI digital cameras offer.
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Camera Simulators