I'm sure it's just to fit in the 709 space.Ahhh ... I see. Thanks.
And regarding its use with no Picture Profile, is it an accepted means to achieving higher dynamic range -- or is it simply "corralling" or shifting the signal to fit nicely within a Rec.709 space?
But I think it looks great once you massage it in Photoshop - for me it's the ability to punch in while recording, the small size and low light that make the a7s a champ. Shooting SLOG and squeezing out a bit more IQ means you are starting at ISO 3200 so if you swap lenses a lot, even with step-up rings you're fooling around with the ND filters (I use Vari-ND) plus it's much harder for ME in my 40's to pull focus on a very flat image. Since I can now correct the WB, exposure, saturation, contrast, highlights/shadows in Photoshop CC, I see very little difference between PP6 + CC vs. PP7 plus heavy grading in other apps. Not worth the hassle. Plus we've been advised to expose 1-2 stops to the right in SLOG - it's damn near impossible to get forcus on a washed out screen - even an external monitor.