

That sensitivity allows the camera to see a full seven stops of over exposure and another seven stops of underexposure.
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The Alexa's CMOS Super-35mm sensor is rated at 2.8K and ISO 800. The Alexa, announced in April 2010, was the first camera released of the product family. The range of Alexa models has expanded over time:

The price of the camera depends on model and accessories as an example in 2015 an Arri Alexa XT cost approximately $66,000-100,000, depending on accessories included. The Alexa camera system includes modularity, PL mount lenses, a Super 35 sized CMOS sensor shooting up to 3424×2202 resolution and supports uncompressed video or proprietary raw (ARRIRAW) codec.
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The Alexa camera offers additional optional software licenses that unlock different capabilities of the Alexa Camera including High Speed 120fps recording, DNxHD codec and 4:3 "Open Gate" Mode for anamorphic lenses. 709 HD Video color space or Log-C to ProRes or ARRIRAW codecs. The camera has several methods of recording, including SxS cards, CFast 2.0 cards and SXR Capture Drives at resolutions up to 3424 × 2202 pixels in either Rec.

The Alexa camera system introduced their Log-C imaging science as a digital negative to make digital cinema images process like scanned film images. 5557 I.I.Arri Alexa camera being used with Master Steadicam
