Curtis N wrote in post #5709197
Manual flash, with a meter, is more consistent and predictable. It is also more time-consuming and requires getting the meter in the subject's position. This is not always practical, or even possible.
Automatic flash metering is for those situations where manual flash isn't practical. Automatic flash metering has been around for 40 years in one form or another. E-TTL is just the latest form.
As usual, Curtis, I agree with all you have said.
On caveat, however....
While you need a meter to do manual flash, it does not, necessarily, have to be a separate meter (from the excellent one in the camera) and you do not need to get it in the "subject's position".
If you are shooting RAW, you main focus is to get the highlights corrects....that is, "expose to the right"....without blowing out the highlights.
This can be done with simply a white terry cloth towel and a few test shots.
Chuck Gardner explains this very well.
Here.... http://super.nova.org …stem/WhiteTowelMethod.pdf
With a follow up, here... http://super.nova.org/DPR/Equipment/SpotMeter.html
One of his FM forum post, explains it in quite simple terms:
"...For digital correct exposure of textured highlight detail is critical. Get those right and everything else falls into place, at least down to the end of the range your camera can record.
Get a white terry wash cloth or towel, or any white fabric with texture visible in the camera LCD playback. It will become your "canary in the coal mine" for correct exposure by just looking at it in the playback. When you see it looks white, still has texture and is not blacked out in the overexposure warning you'll know at a glance it and everything next to it is perfectly exposed. Simple no? It provides a standard frame of reference, both visual via the texture -- which is why a towel not a card is used -- and via the simplest of all exposure indicators on the camera, the overexposure warning.
The histogram is useful for gauging underexposure via the gap on the right, but not for overexposure. The OEW shows you exactly where in the image the highlights are clipping. Used to together with a standard highlight reference like the towel it is very easy to get correct exposure in two shots: Test, evaluate, adjust, perfect exposure.
Have your portrait subject hold it crumpled for a bit of shadow detail, next to their face. Metering mode really isn't important. I just leave my camera on evaluative. Point the camera an shoot a test shot, M or Av, doesn't really matter, but if you use Av make the size of the towel small so as not to influence exposure later when its not in the shot.
Look at the file in the playback, if the towel is blacked out (clipped highlights) back off the exposure. If there's no part of the towel blacked out increase exposure until the brightest parts -- the specular reflections - black out. Since a RAW file has more highlight headroom than the dinky thumbnail used for the playback that will usually indicate the point where exposure is perfect..."