So … I put wrong unit on my Canon 550d, writing 23.96 time code to audio track. Zoom F8 as master time code set to 25, also video is 25. Used RTC. Zoom have the audio to use in project.
What do to?
Time code is only metadata, the video files are ok.
Connected my units to the setup software. Noticed that the used unit was almost two sec. out of wanted sync. I checked every video file in Reaper with the sound files from Zoom F8, and yes, same two sec out of sync on all of them.