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Header image for article ALEXA's Anamorphic De-Squeeze Explained

ALEXA's Anamorphic De-Squeeze Explained

ARRI ALEXA De-squeeze menu

ARRI has released their Anamorphic De-squeeze download license for purchase. This eagerly anticipated license for the ALEXA will correct the "squeeze" effect that occurs when shooting with anamorphic lenses. With the license installed, ALEXA and ALEXA Plus cameras with the Software Update Packet (SUP) 4.0 can now readily accept anamorphic lenses with 1.3x or 2x magnification.

Anamorphic lenses contain optical elements that capture a 2.39:1 image and squeeze it onto the 1.78:1 ALEXA imager. With the Anamorphic de-squeeze activated, the image appears "normal" in the camera for monitoring and playback.

The Anamorphic De-squeeze includes four modes for monitoring: De-squeeze off, De-squeeze 2.0x, De-squeeze 2.0x & magnify, and De-squeeze 1.3x.

De-squeeze 2x

2x Anamorphic lenses squeeze the image by a factor of two. In 2x, the de-squeezed full sensor image appears normal in the viewfinder and monitor with extra recording image area to the left and right of the 2.39 aspect ratio.

De-squeeze 2x & Magnify

In 2x & magnify mode, the 2x image is enlarged to practically fit the 2.39 aspect ratio, with little extra area on the left and right. This mode is for monitoring use only, as it does not work in Playback mode.

De-squeeze 1.3x

Developed specifically for the 16x9 sensor, the 1.3x anamorphic lenses squeeze the image by a factor of 1.3 instead of 2. Used with 1.3 lenses, the De-squeeze 1.3x mode will compensate for the squeeze and fit the 1.78:1 (16x9) sensor size.

For more information, download ARRI's white paper on the Anamorphic De-squeeze option.

Ian McCausland
Camera Technology Specialist, AbelCine LA

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