ALEXA 35 SUP 1.0.3 Release Notes
Page 8 of 15
All data subject to change without further notice.
19 Recording Formats
Recording formats can be set with three parameters: Recording Codec, Sensor Mode and Recording Resolution.
• The
Recording Codec
defines the image content encoding. The options are ARRIRAW or Apple ProRes.
•
Sensor Mode
defines the number of photosites that are being read out from the sensor. Thereby it also defines
the area used on the sensor; this is important to know to see if the lens' image circle covers. Sensor Mode also
influences the maximum possible frame rate and the data rate. The Sensor Mode part of the name is further
divided into two parts:
- First is the number of horizontal photosites used on the sensor in “K”.
- Second is the aspect ratio of the sensor area that is being read out.
• The
Recording Resolution
defines the number of pixels recorded in the ARRIRAW or Apple ProRes file, possibly
with de-squeezing or down-sampling for Apple ProRes. Sometimes, as in “ARRIRAW 4.6K 3:2 Open Gate”, the
number of photosites read from the sensor and the number of pixels recorded into the file are the same (here
4.6K); no in-camera processing has been applied. In other cases, as for instance in “Apple ProRes 4.6K 16:9 - 4K”
the number of photosites read out from the sensor is larger than the number of pixels recorded into the file. In this
case, the in-camera processing has down-sampled the 4.6K image from the sensor to a 4K image to reduce the
data rate. The aspect ratio of the recorded file remains the same as that of the sensor mode and is therefore not
noted again.
Side Display
Camera settings can be viewed and changed on the side display on the camera left side, right above the media bay.
This is great when working with TRINITY, Steadicam, Easyrig, drones and cranes with the viewfinder not connected to
the camera. The side display has three pages: HOME, INFO and SETTINGS.
Real-time Streaming Metadata
The ETH (Ethernet) connector outputs real-time streaming metadata for virtual productions. This includes all relevant
frame-based lens and camera metadata and is received by ARRI's Live Link Metadata Plug-in for Unreal Engine.
Power Options
ALEXA 35 is a 24 V camera with an input range of 20.5 V – 33.6 V. It cannot be operated with 12 V power. The power
draw of the camera and the MVF-2 viewfinder, when recording Apple ProRes 4444 at 24 fps, is about 90 W.
There are two power inputs: PWR and BAT.
• The PWR connector on the camera's right side accepts the same cable as used by ALEXA Mini and ALEXA Mini LF.
• The BAT interface on the camera's back is used for on-board battery adapters that mount directly to the camera.
- The camera ships with a B-Mount battery adapter, and most on-board battery manufacturers have 24 V B-
Mount batteries in their program.
