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ARRI ALEXA - Page 81

ARRI ALEXA
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Main Controls 81
Output range Defines which bit range of the full 10 bit (0-
1023) is used to transmit image data.
Legal: Uses values 64-940 for RGB and Y
signals, and values 64-960 for CbCr
signals. This complies with the SMPTE
274M 8.7.
Extended: uses values 5-1019, which
results in about 10% more steps. Complies
with SMPTE 274M 8.12 (called
undershoot/overshoot).
Note: Check which mode your recorder
supports. If you set the camera to extended,
but your recorder only supports legal, you will
end up with clipped images!
REC OUT fps sets
sensor fps
If set to "On", the sensor will always follow the
REC OUT frame rate setting. This ensures no
frames are dropped on the output.
SDI remote When set to "On", the REC OUT and MON
OUT will carry a flag in their data stream to
signal an external recorder if the camera is
currently recording internally. When SxS
recording is switched off, the REC button will
only trigger the sending of this flag.
Vari flag When set to "On", the Vari flag marks duplicate
images in the HD-SDI stream. A recorder that
supports the Vari flag can detect these frames
and discard them. This makes sure that no
duplicate frames are recorded if the HD-SDI is
set to a higher frame rate than the sensor.
HD-SDI formats and corresponding frame rates
Format Links
Used
Image
Raster
Sampling
Structure
Color
Mode
Possible
Frame Rates
(fps)
422
1.5G SL
1 1920x108
0
4:2:2 YCbCr 23.976, 24,
25, 29.97, 30
422
1.5G DL
2 1920x108
0
4:2:2 YCbCr 48, 50, 59.94,
60
422
3G SL
1 1920x108
0
4:2:2 YCbCr 48, 50, 59.94,
60
444
1.5G DL
2 1920x108
0
4:4:4 RGB 23.976, 24,
25, 29.97, 30
444
3G SL
2 1920x108
0
4:4:4 RGB 23.976, 24,
25, 29.97, 30
444
3G DL*
2 1920x108
0
4:4:4 RGB 48, 50, 59.94,
60

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