The Arri Alexa (stylised as ΛLEXΛ) is a digital motion picture camera system made by Arri first introduced in April 2010. The camera was Arri's first major transition into digital cinematography after smaller previous efforts such as the Arriflex D-20 and D-21. Alexa cameras are designed for use in high budget feature films, television shows, and commercials. Alexa uses the ALEV series of image sensors manufactured by ON Semiconductor.
On 28 March 2019, Arri announced the Alexa Mini LF, which houses the same sensor as the Alexa LF inside a camera body similar to the Alexa Mini. Additional improvements over the Alexa Mini include an improved EVF (MVF-2) with larger flip-out monitor and power outputs for camera accessories. The camera also features a new Codex recording module, which accepts 1TB Codex Compact Drives.
On 2 February 2018, Arri announced the Alexa LF at the BSC Expo. It's a true 4K Large Format Camera. The ALEXA LF’s A2X sensor is based on two vertical ALEV-III sensors, which are stitched together to create a seamless large format image. This is the same principle as that with which they created the ALEXA 65, which uses three Alexa sensors that are arranged vertically. The ALEXA LF can record in Open Gate in a resolution of 4448 x 3096.
On 24 February 2015, Arri announced the Alexa Mini. It has the same sensor as the other Alexa cameras. It features in-camera recording to CFast 2.0 cards, 200 FPS and 4K UHD in-camera upscaling.
On 18 March 2015, Arri announced the SXT line of Arri Alexa cameras which will support in-camera upscaling of Apple ProRes to 4K resolution and Rec. 2020 color space.[13][14] Arri also announced the SXR module which can upgrade XT, XT Plus, and XT Studio cameras with the SXT features.