ARRI Alexa Mini LF Sensor Modes

A summary of the resolution and codec options available in the different sensor modes of the ARRI Alexa Mini LF digital cinema camera.

Ben Bateman

Updated 25 Aug 2022

·

3 min read

The ARRI Alexa Mini LF has a total of nine sensor modes (as of SUP 7.1). It can be difficult to remember the image circle, clip resolution, codecs and frame rates offered in each mode, so we've summarised them for you here.

Visualising The Different Modes

Here is an interactive visualisation of the different sensor modes. For each mode you can see the number of pixels (photosites) of the sensor used, the physical size of the sensor area used to record the image, and the image circle needed to cover the sensor mode (useful for determining if your lens choice will cover the mode you intend to use).
Hover over an area or click/tap it to see a summary of the sensor mode.
Alexa Mini LF sensor modes. Hover over a mode, or click/tap it to see a summary of the mode.

Recording Resolutions and Codec Options

Some sensor modes allow you to choose a clip resolution different to the number of pixels used by the sensor mode, while others do not. Modes also offer different codec options (ARRIRAW or ProRes) and maximum frame rates. Below is a breakdown of the options available for each mode.
ARRI Alexa Mini LF Sensor Mode Comparison
Sensor ModeClip ResolutionCodecsMax FPS
4.5K LF 3:2 Open Gate
4448 x 3096
ARRIRAW
40
ProRes
40
4.5K LF 2.39:1
4448 x 1856
ARRIRAW
60
ProRes
60
4.3K LF 16:9
3840 x 2160 (UHD)
ProRes
48
1920 x 1080 (Full HD)
ProRes
75
3.8K LF 16:9
3840 x 2160 (UHD)
ARRIRAW
60
ProRes
60
2048 x 1152 (2K)
ProRes
90
1920 x 1080 (Full HD)
ProRes
90
2.8K LF 1:1
2880 x 2880
ARRIRAW
60
ProRes
60
3.4K S35 3:2
3424 x 2202
ARRIRAW
60
3.2K S35 16:9
3200 x 1800
ProRes
75
3.2K S35 4:3
2880 x 2160
ProRes
75
2.8K S35 16:9
2880 x 1620
ProRes
100

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