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Flaat for the Sony a7s


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Flaat for Canon DSLRs: Presentation Technical tests Download
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Flaat for the Sony a7s: Presentation Technical tests Download

Flaat for the a7s

I recently bought a Sony a7s. It's a very nice camera, I'm really happy with it. Of course, after receiving the camera, the first thing I had to do was to play with the settings until I found the ones I like most.

This camera can't take custom-made picture styles, so what you'll find here is not something to download and install in the camera, but a list of settings that tries to get the best possible results when shooting video with the a7s. That list of settings is what I call Flaat for the a7s:

* Use PP7 (reset it if you have been fiddling with it before)
* Color Mode = Cinema (s-gamut3 has issues, cinema is better)
* Set Saturation = +15 (better bringing it down in post than up)
* Set Color Depth = 0 +1 0 +5 -3 0 (for each of RGBCMY)

That's it, but if you want a complete list of settings, go here.

Apart from that, note that I usually overexpose by one stop with respect to what the camera tells me to do. It's cleaner that way, there's very little risk of clipping the highlights, and colors don't suffer (a 3-stop overexpose would start to look bad).

I have found these setting to provide a very wide dynamic range (because it's based on s-log2), to be very easy to grade (s-log2 is so, so nice), with very accurate colors (cinema, with the minor tweaks mentioned above) and a decent amount of saturation (I have always found that adding saturation in post is a way to accentuate image issues, so I always prefer to get the image somewhat saturated in the can and then desaturate it in post if the final look calls for that).

I didn't touch the knee or the black gamma, because I found that playing with these parameters only messed up with the beautiful slog2 curve, without bringning any benefits in return. I also didn't play with the sharpening parameters: I leave them at minimum, with the default detail settings. I tried to tweak them, to get rid of the highlight aliasing issue, but I couldn't, so I'll leave them be.

Sample videos:

El Escorial (landscapes) (ungraded: this is straight out of the camera)

Japan Weekend Madrid 2014 (people) (graded)

Many more sample videos here.

Technical tests:

This is the very beautiful light-response curve that Flaat gets, thanks to being based on slog2 (each wedge is a third of a stop):

And this is how accurate colors are with Flaat:

Dynamic Range test: slog2 (Flaat) vs Cine4
Color stability test: color chart + exposure ramp (tested because sgamut3 is bad in this respect)
Color accuracy tests (s-log2 vs cinema, sgamut3, pro, etc)
Light response curves (s-log2 vs cine4, and also tests with knee and black gamma)

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