Arri?s new Alexa Super Xtended Technology camera

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Arri s new Alexa Super Xtended Technology camera --

Thu, 19 Mar 2015 09:25

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ARRI s new Alexa SXT (Super Xtended Technology) offers ProRes 4K recording, improved image quality, powerful colour management and three fully independent HD-SDI outputs.

With in-camera recording of ProRes 4K UHD (3840 x 2160 pixels) and ProRes 4K Cine (4096 x 2637 pixels), Alexa SXT cameras are the ideal choice for productions that need 4K UHD TV or 4K DCI cinema deliverables.

Alexa SXT cameras keep the acclaimed 3.4K ALEV III sensor of previous Alexas and add the electronics of ARRIs Alexa 65 camera. These high-performance electronics combine the latest generation of FPGA processors with a fast internal backplane and form the basis of a completely overhauled image processing chain, advanced pixel correction and optional noise reduction. This results in a further improvement in overall image quality. Like their XT predecessors, Alexa SXT cameras retain Open Gate, 4:3 and 16:9 sensor modes, which can be recorded in ARRIRAW or ProRes.

Taking advantage of the extremely wide native colour gamut of the Alexa sensor, the new advanced colour management engine allows greater control. A new type of look file, the ALF-2 (ARRI Look File 2), contains an ASC CDL (Colour Decision List) as well as a 3D LUT (Look-Up Table). The new colour management engine can easily match the look of current Alexa cameras, but also provides the basis for radically different looks. In addition, previewing of looks on set is improved, including the option to use the wide colour gamut of Rec 2020 gamma, while dailies creation is made more efficient and final grading made faster. ALF-2 files and the tools that create them are compatible between Alexa SXT, Alexa Mini and Amira.

To further streamline on-set workflows, Alexa SXT cameras include three fully independent HD-SDI outputs. This allows, for instance, a Log C image to be used to show the director a pristine image with live grading, a clean Rec 709 image to be fed to video village, and a Rec 709 image with status information overlays to be displayed on the cameras on-board monitor.

The first Alexa SXT cameras are planned for release around mid-2015; the full range will comprise Alexa SXT EV, SXT Plus and SXT Studio models, replacing current Alexa XT cameras (though the Alexa Classic EV model will remain in the line-up).

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