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The following topics provide information about setup and calibration. Read them in conjunction with the ARRI ALEXA Mini LF Manual (PDF download from arri.com).
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Use of the rolling shutter
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The timecode cable is used to carry an LTC signal from the sync and timecode generator. At the camera end, a 5-pin lemo connector plugs into the port on the camera labeled TC, and at the other end is either BNC or XLR, depending on the type of device being used. Plug it into an LTC output on the timecode generator, which is usually labeled LTC or Timecode.
As usual when using timecode, set the timecode generator to provide LTC at a rate equal to, or exactly half the video frame rate desired, as LTC rates only go up to 30 Hz.
To set up the camera for timecode:
Navigate to HOME
>> TC > Options > Run Mode and ensure that the value is set to Free Run.
In this mode, the timecode continues to count up, even when not recording on the camera, which is the behavior required by Shogun Live.
Navigate to HOME > TC > Options > Mode and ensure that the value is set to Regen.
In this mode, the timecode does not sync to the input once, but keeps in track with it, except when the camera is recording. If the timecode generator is also providing sync/genlock and the standards are set correctly on both outputs, there should be no discontinuities in the timecode received.
- As an additional check that the settings are correct, navigate to HOME > TC > Options > Regen Source and ensure that LTC in is displayed.
The camera displays TC in white when it has a timecode. The timecode itself is also shown on the camera's display.
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- On the camera, plug the cable into the connector labeled SYNC IN.
- Ensure the cable is connected to a tri-sync output on the timecode generator, and set the video standard to that required for the camera.
Scroll pagebreak - Navigate to MENU > System > Sensor > Genlock Sync and set the value to SYNC IN.
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| Important Check that the GEN message changes to orange when the cable is removed. It is important to do this to verify that the genlock input is being used, rather than the camera obtaining sync from timecode, which we don't recommend. |
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To change the video standard:
Navigate to HOME > FPSand use the jog wheel to choose the desired frame rate.
- Navigate to MENU > Monitoring > SDI > SDI 2: Clone SDI and ensure that the checkbox is cleared.
Scroll pagebreak - Navigate to MENU > Monitoring > SDI > SDI 2 Format and set it to the desired video transport format. For example, to enable 2160 p (4K) output, change SDI 2 Format to 422 6G UHD.
