Alexa XT M with Cooke /i ?

Fri Jan 15, 2016 8:33 pm

Just put a Cooke /i zoom, the "Ang 25-250DP Optimo Style" onto an "Alexa XT M" but no sign of Lens Data, I appreciate that LDS and Cooke /i are two different interfaces but I can only find settings for LDS which is selected ON in the menus, But No LDS lens is seen. Is there some other way to enable a Cooke /i lens?

Lens is orientated correctly with contacts at the top position.


Posts: 18
Joined: Wed Dec 16, 2015 3:15 pm
Location: UK

Re: Alexa XT M with Cooke /i ?

Tue Jan 19, 2016 8:15 pm

Greetings Oliver,

The information you're looking for may be buried in this FAQ:

ALEXA XT cameras also support the Cooke/i protocol. Non-LDS lenses can be accommodated by storing the lens profile in the camera and using an ARRI lens motor. This is called the "Lens Data Archive" and provides all the features of the LDS. (sic)

Normal LDS lenses are automatically detected by the camera (model, focal length, DOF, etc). Other lens systems (such as Cooke/i) must be selected via the LDA settings menu. If your Angenieux is not listed among the lenses stored in the camera, a custom LDA table must be created. There is more information on the creation of LDA tables here:

For cameras which cannot create tables internally, here is a video about doing so via the wireless system:
Stephen George
Posts: 1
Joined: Wed Dec 02, 2015 6:52 pm
Location: Los Angeles

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