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--Update: Technicolor took town the LUT file and replaced it with a .mga file. This should work just the same in LUT buddy without the "changing Pattern" workaround.--Yesterday I covered how to use a LUT file without any plugins, but was informed that some editors don't have support for custom curves. So I downloaded a trial of Premiere, since I don't have a Mac, I cant test Final Cut, and fiddled around with LUT Buddy till it worked. The secret? Upload your LUT file in setup, then change the "Action" to "Draw Pattern", then the "Pattern" to "3D 64", and then the "Action" back to "Apply LUT". And that's it!
Here is my quick video tutorial showing how to do it in Premiere, but hopefully it works the same in Final Cut:
The only change I would make is putting the LUT file somewhere in the Adobe directory, or other location you know will continue to be around, instead of with the project files so it doesn't get deleted or lost when you move on to another project.