This is literally the best video on the subject I have seen!

this channel is a hidden gem! Keep up the great work!

@shagral

Жыл бұрын

Thanks a ton!

I used to call myself the "Shooting LOG GAMMA" police. Tryin to explain why so many KZreadrs misunderstand ISO, amplification, data spaces, etc. The desire of most filmmakers to believe some GAMMA setting and LUT is going to get them on Netflix is overpowering. The descriptions you wrote for your chapters are like a short bible on how cameras really work. The only thing that would keep me going is some people who would comment, "I always wondered why my skin tones seemed blotchy and off" (because they were shooing an aggressive LOG in controlled lighting). Anyway, glad to see others trying to enlighten filmmakers on this fascinating stuff!

@shagral

10 ай бұрын

It's really hard to learn that stuff organically. You have to really seek it out and wade through heaps of bad info. But yeah, I'm glad it's helped a couple people out. Thanks for watching!

I was shocked when I saw your subscriber amount.. Great video!

@shagral

Жыл бұрын

Thank you! We are all at the mercy of the algorithm 🥲

Thanks for the video. Your explanation of ISO helps unravel a few mysteries.

@shagral

6 ай бұрын

Thanks for watching! Glad it helped you

@ComradeReptiloid

5 ай бұрын

​@shagral I saw quite a few videos exposing age old myths poping up recently. The only one that can compare to yours in details and accuracy is by professional colorist who included his grading workflow and practical tips. But your research, production value and pacing are superior. And the tips for LUTs is the extra icing many creators ignore.

Subscribed! Looking forward to your future content.

@shagral

11 ай бұрын

Awesome, thank you!

TDLW: Iso is actually gain (like in your NLE) There are only two ways of ACTUALLY changing the exposure: aperture and shutter speed The camera has artificial noise reduction when you have a dual native iso Native iso is the manufacture’s opinion on the best balance between shadows and highlights for the given sensor

Fantastic! Gold advice right here 10:15 This exactly why I was having an issue - I was adjusting exposure AFTER I applied the LUT

@shagral

11 ай бұрын

Glad it helped!

Now it makes sense to me

This was very helpful! Thanks!

@shagral

Жыл бұрын

Thanks for watching!

Great video and article. Very hard to find good information on this topic. I have been trying to understand why the fuji x-t3 base ISO is 160 (0 gain) for photos and standard video but in f-log base ISO is 640. I'm a little less confused but still not sure how base ISO (0 gain) can have 2 different values excluding a dual base ISO sensor. I understand that the dynamic range setting at DR400 requires a minimum ISO640 because the camera actually exposes 2 stops under using base ISO160 and then brings up the shadows when processing jpegs. I was thinking something similar might be happening here. It's got me wondering how shooting video with ETERNA video profile at DR400 ISO640 compares to f-log ISO640. Subscribed and keep up the excellent information.

@shagral

9 ай бұрын

Hey, thanks for watching and subbing! The brief answer to your question is at 6:12. Log gammas (f-log video) and linear gamma (raw photos) are exposed differently, hence the difference in base ISO. No gain is being applied, it's just a number that you would have to put into a light meter to get correct exposure for your chosen gamma.

I recommend watching this entire video at least 2 times.

@shagral

Ай бұрын

I fully support this recommendation.

In the Exposure to ISO chart's the 18% Gray point sort of marches down with with Increased ISO, but what I've not seen said anywhere is does the 18% gray point also reflect an alignment to color gamut? (Meaning color gamut shifts between your dynamic range bright vs Dark). Since skin tone's are the most important color to match, does this mean that ISO should be used as a tool to place skin tones correctly in the dynamic range or is Base ISO always better? I've heard on the color grading forums that ETTR causes problems during color grading.

@shagral

2 ай бұрын

Colour gamut is a three-dimensional palette, it doesn't shift. But the saturation and lightness of colours of course track with exposure. But in case of shooting 10-bit Log or higher quality, you have complete control of that mapping in post production. ETTR only causes problems if A) clipping of one or more of the RGB channels occurred or B) destructive/incorrect colour pipeline is used (LUTs as opposed to colour management or mathematical transforms). Also, ETTR should not be taken literally, usually after ~1.7 stops of overexposure there is zero benefit to exposing even brighter. And even that is only recommended for really low-key scenes. Hope that helps.

I'm studying filmmaking and recently bought a sony a6600, but i just can't find what the native ISO is, if you google it it just tells you the recomended range wich is completely useless (it's 100 - 32,000)

@shagral

10 ай бұрын

Quick google search says it's a dual gain camera with low base at 100 ISO and high base at 400 ISO. Seems about right to me. Source: cuchara.photography/2019/06/iso-invariance-and-the-sony-a6500/

Great video on a very misunderstood concept! My question - in a dark situation, instead of using negative gain, is it better to just leave things as-is at your (highest) base-iso, and change 'exposure' (gain) in post???

@shagral

Жыл бұрын

The goal is to get your waveform above the noise floor as much as possible without clipping the highlights. Negative gain is just a way to lower the noise floor (at the cost of DR in the highlights). But I wouldn't bother with that if you have a modern-ish camera (say 10 bit and ~12 stops of DR). Everything else depends on your camera and scene!

@johnsek4294

10 ай бұрын

@@shagral I have this question too, in your situration, negative gain lower the noise floor, but at the same time, the brightness of shooting subject lower too, which means the signel and the data we want, also lower and still within the noise floor, how do we get benefit frow negative gain in low light situration? And thank you so much for the video. I am enlightened!

@shagral

10 ай бұрын

@johnsek4294 low light doesn't mean no light. If we are talking about cinematic exposure (meaning you have some control over light) then you will have to pour more light on your subject to compensate for lower ISO. But you shadows will be cleaner. If it's a total run and gun and you are shooting a black dog on a moonless night then don’t shoot in LOG!