FS5: FS5 - A7 Slog2 or 3

K

Karl Karlsson

Member
Can i pick all your brains?

I have a long form doco coming up and main cameras will be FS7/5 i want to shoot in Slog3/Gamut.Cine as it doesn't have the greenish/yellow shift that Slog2 does.

But i am using a A7 for a B camera and its 8bit 420 and am aware that Slog2 hold up better with 8bits.

What yr thoughts shooting Slog3 with XAVC-S ? Exposing to the right ETTR and bring down in post will it degrade too much? I don't have any A7's at hand to do test so thought i'd ask here.

I know it sounds lazy - I should go and hire a A7r/A7s etc and do side by side with FS5/7 but don't have the time , hence getting on this board to pick a few brains :)
 
Karl Karlsson said:
i want to shoot in Slog3/Gamut.Cine as it doesn't have the greenish/yellow shift that Slog2 does.
Click to expand...

Where did you hear that baseless piece of misinformation? It's ridiculous the stuff that gets posted as if it were fact.

BTW, I wouldn't recommend shooting either type of S-LOG with a lowly 8-bit 420 codec no matter what camera it was.
 
Hi Doug.

Its not baseless misinformation, I didnt find this from a posted comment, its from my own tests using a model my eyes and scopes. Slog2 in Cine.Gamut has a yellowish cast even after white balancing, Luts, correction etc etc. Put Sog3 side by side yourself and prove me wrong.

I know its not recommended shooting S-LOG3 on an 8bit 420 codec but I'm using it to match my A Cam shooting Slog3, and was asking wanting to pick peoples brains.
 
Hi Karl, I don't have time to spend proving you wrong, but thousands of people shoot S-LOG2 every day (including me) and you are the first person I ever heard mention a yellowish cast. I can only conclude that you are doing something wrong in your workflow. Whether you choose to believe me or not doesn't matter, but as a fellow owner of these cameras I feel it is important to challenge misinformation so others reading this thread do not come away with the wrong impression. I want to make it clear that I don't agree with your statement and I think you are completely wrong about S-LOG2. And using an 8-bit codec is a mistake for S-LOG. You asked for opinions and I have given you mine, but you are free to ignore it. :-)

BTW, you can't choose Cine.gamut with S-LOG2.
 
My mistake I meant S Gamut matrix.

This yellowish/greenish cast is also mentioned by Alister Chapman in his VOCAS video, so I'm not alone in seeing this. It is not misinformation and i know how to expose and white balance.

I filmed my wife in Slog2 Sgamut - white balance in Resolve applied LUT and colour corrected - and she even said "why does my skin have a yellowish tinge"
The Slog3 with Cine Gamut - white balance in Resolve applied same LUT etc did not have this.

I even put the Slog2 to different matrices like Cinema & Pro and the yellowish cast was gone.
 
Hi Karl,

the FS5 does that as well with S-Gamut? I thought it was just the A7s after applying a SL2/SG to SL2/709 LUT, that the yellow/oranges get pulled into yellow/green. I want to write a post about that soon anway, to gather other user's experiences.
To fix that I apply Hue/Hue and Hue/Sat curves in Resolve.

You should be able to change from SL2/SG to SL2/SG3.cine if you modify the picture profile in the FS5. You could also go straight to SL2/709 (gamma/gamut) by using the Pro or ITU matrix.
S-Log2 is not compressing the DR so much, so you will be using the 8 bits more effectively. ETTR should not be any issue, unless you clip something. Have a look at LutCalc. You can create LUTs to adjust exposure in post.
 
Yep FS5 does it. Its subtle but is there and i should have mentioned its skin tones where i see it.

Good idea suggesting changing the Slog2 to a SG3.cine matrix, will give it a try.
 
Doug Jensen said:
Hi Karl, I don't have time to spend proving you wrong, but thousands of people shoot S-LOG2 every day (including me) and you are the first person I ever heard mention a yellowish cast. I can only conclude that you are doing something wrong in your workflow. Whether you choose to believe me or not doesn't matter, but as a fellow owner of these cameras I feel it is important to challenge misinformation so others reading this thread do not come away with the wrong impression. I want to make it clear that I don't agree with your statement and I think you are completely wrong about S-LOG2. And using an 8-bit codec is a mistake for S-LOG. You asked for opinions and I have given you mine, but you are free to ignore it. :-)

BTW, you can't choose Cine.gamut with S-LOG2.
Click to expand...

Just FYI Doug,

Alister Chapman states this in his video "Cine Gamut captures as much colour as possible off the censor and as a result they capture more of a green picture information. When u bring this down into a say a REC709 the colour shifts. So every time you make a colour change with S-Gamut there is a green shift to the picture. Slog3 Cine.Gamut doesnt do that".

Sounds pretty factual to me.


 
You know, it would help if you would identify the camera sooner in the thread that you are shooting with. If you're quoting Alister's Vocas video I take it that you're NOT talking about the FS7 in CINE EI mode??? Why not the FS7, that is the camera you mentioned first in this thread? If you're making broad statements about S-LOG2 you should identify the camera. And if you're shooting tests with S-LOG on the FS5 with a PP who knows what you're going to get because it doesn't have a CINE EI mode and does represent what can be done with the FS7, F55/5 shooting S-LOG2.

So now that we know which camera you are looking at, I can't say whether you are correct or incorrect about skintones on the FS5 using S-LOG2. I've never bothered to test skin with those settings on that camera because I'd never use S-LOG2 for that scenario.
 
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Never use Slog2 with 50Mbps XAVC-L 10bit 422 ? Well me too after many tests.

Cine4 holds up so much better without difficult grading and a weird skin tones. And the Sony LCD gamma assist LUT is terrible.

Besides that i love the FS5 ! - And with the new firmware coming soon to set Zeberas 0% - 109% i'll love it more :)
 
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