Excellent. Thx!

"70 for flesh tones and 100 for peak white."

Having seen a lot of faces in very bright lights at the theater, I have noticed that some faces reflect a lot of light while others reflect much less light.

Having two people in the same scene who are on the extreme ends of this range can make using the zebra (70) for flesh tones a bit of a challenge. One face may be a bit too bright and the other a bit too dark. To adjust for the brighter one then the darker one may end-up being way too dark. To adjust for the darker one, then the brighter one can easily be overexposed. So what does one do? It is much easier to adjust in post for underexposure than overexposure but there is no guarantee of getting the results one wants. And theater lighting is not optimum for video most of the time. Isn't this fun? LOL!

Those with very, very dark flesh tones cannot be adjusted for with 70 at all.

So it is best to use 100 for scenes that have a wide range of light reflections so that most of the scene is just under the 100 in the brightest areas with only maybe a few items over 100.

With a face only such as in a spot light with a person who's face is lighter and reflects more light then you can use 70.

In a nut shell, there is not always a simple answer to your question.

The zebras can be used as a general guide but one cannot always count on them because of the many different shooting situations.

One must know their camera and what it can and cannot do to know best what settings it should have. And that takes a lot of practice shots.

I wish there was a simple answer for all scenes but there is not.

On the camera in question, if it is used with auto-exposure, I would set the AE Shift to -1.0EV. The Sony cams in the consumer range have a bad habit of leaning towards brighter and overexposed. They do this on purpose to make things look much brighter but in doing so they tend to overexpose the video in many areas. The -1EV is the same as 1 stop down.

It is always best to err on the underexposed side a little bit instead of on the overexposed side. Well, 'perfect' exposure is best but it can be a challenge to get when everything is changing on you. Faces, colors and the entire overall video looks much better this way. Once overexposed, it can be very difficult to impossible to make it right in any NLE. A little underexposed can easily be made brighter.

I just takes practice as to what to do with each different camera one may have.

I hope this helps.