Tentacle’s producing TC that is 2/3 frames out

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I’ve been noticing on all shoots that my 3 x tenacles are being used on that when they after syncing in Premiere the footage ends up being 2 or 3 frames out inconsistently.

 

During the shoots we use REDs and Alexa Mini’s and found that sync has this issue regardless of cameras used. I check all feeds and even run a Tentacle on the 688 or F8 to make sure they all have the same tentacle feed. I check TC several times a day with a count-off – all devices are prepped correctly.

 

We import the footage and use the Sync by TC command in Premiere to align the footage.

 

Any insights as to why the files are not perfectly in sync?