As I see it there is so many reasons why its better to separate sound from camera completely.
- Microphone close to camera, no good.
- Cables between camera and microphone, no good.
- TC sync lock between camera microphone is usually a hassle.
- Lockit boxes is a hassle.
-Fan noise.
Make sure clock on camera and Sound equipment is somewhat in sync.
Use camera for picture and scratch track coming from the built in mic and possibly the smallest of headphone jack microphone.
Then when dumping your Camera mags. Put corresponding sound files in the same folders.
Later in post do a "sync with wave form". Takes no time and kind of always work.
If you learn how to work it that way, you get around a lot of the hassle caused by things that is no longer really needed / was invented back in the days when things was more difficult and post was a pair of scissors and tape.
To me this is the best onboard microphone I found so far. Small, low cost and quite good as far as scratch sound goes. Put it straight into the I/o module and record that together with the built in mics on camera.
https://www.dustinhome.se/product/50...iABEgJDZvD_BwE
It has saved us plenty of times when the externally recorded sound was faulty, which should not happen but yes, it happens.
Also a off camera sound recorder is more future proof. The Pro I/O module or similar that goes onto camera gets old rather quick. If you buy something that works on its own it will last way longer. And today the zooms or what ever are small enough so if you really want on board audio its quite easy to gaffer it on.