ISO 16,000 should be very close and the tests should work out fine.ĭom does the same exact test for recovery that he did at ISO 640 for ISO 16,000. I wish Dom did these tests at ISO 12,800. The noise cleans up significantly when he moves from ISO 10,000 to 12,800. Production models moved this down to ISO 12,800 and that can be seen if you go back to the ISO tests earlier in this video. The reason for the cagey attitude from Sony is that true dual base ISO should have near exact same dynamic range and noise performance at both settings and the a7S III, while definitely very good, still isn’t the same as if you use the actual base of ISO 640.ĭom says it’s at ISO 16,000, but actually that was only for pre-production models. Still, there is a dramatic improvement for low-light shooting if you use this high base ISO option. It’s definitely not a true dual base ISO, Sony even said as much since it’s the same sensor in the FX6 where they are more open about the high-sensitivity mode. Now, let’s talk about the potential that the a7S III has a dual base ISO sensor. Four stops is very close, but you start to lose some details and five stops isn’t great. Three stops and you have the potential to start losing detail in the highlights if you aren’t careful, but it’s still very good looking. Going one to two stops over and then recovering in post will reduce any noise in your image and actually looks good. Five stops are not going to work out well at all.įor overexposure, at the same ISO 640 base, you will actually find image quality improves. Three and four stops under you start seeing noise, get some magenta shift, and see it starting to fall apart. One stop and two stops are basically the same as the original shot, which is very nice.
As underexposure footage will show off noise when you push the exposure back up.ĭoing a test at ISO 640 and moving down a stop each time, Dom shows off underexposure recovery against a properly exposed shot. Get some light on your scene if you can cause this will be very difficult to work with in post.Įven if you never use those top ISOs, it does come into play during grading if you need to correct the exposure at all. I would save these for absolute last resort, or perhaps a documentary where you have no choice.Īt the very top end of ISO 409,600, you might as well just not bother.
The “high” ISO settings above this, like ISO 128,000 and 160,000 are a problem. Up above ISO 64,000, the image gets a bit softer from the noise and then 102,400 is a very hard upper limit. Still, you are getting the green shift now. However, Sony appears to have a much better handle on the more difficult and uglier chroma noise. Going up and up to 32,000 and 40,000, you might have some issues with noise and softness. Once you hit ISO 25,600 you definitely have noise. Interestingly, it actually cleans up a bit when you hit ISO 12,800 – more on that later. ISO 8000 and 10,000 are getting noisy, though I would say the a7S III is still earning its title of low-light king. You are probably okay up through ISO 6400, especially if you are able to overexpose a stop and then pull it down. ISO 4000 is where you really start noticing some noise, but it still isn’t a problem. ISO 12 may show noise in very dark shots and it goes up a little more as you push up to ISO 3200. Going up again ISO 8 start to show some noise, but it’s still perfectly usable. One extra test here is that they overexposed the camera by a stop and then pull it down in post, which will prove that this is a way to shoot S-Log3 and minimize noise. ISO 640 is the base ISO and performance is, as expected, very good. ISO 250 and 320 are negligible in noise and 400 and 500 looking nearly the same. Unsurprisingly, ISOs 160 and 200 are perfect. Starting at ISO 160 you are actually using a “low” ISO setting that is below the camera’s native S-Log3 ISO of 640. Shooting in S-Log3 to UHD 4K XAVC S-I 24p at 10-bit 4:2:2 and 240 Mb/s, you are looking at the best the camera can do internally. With a bench test and shooting target, Dom runs through all the a7S III’s ISO settings.
#Gh5 lut for iso 12800 how to#
It’s always nice to see how a camera performs throughout its entire range to see exact where there are and aren’t limits as well as find out how to best handle the camera during shooting. Just how good is the a7S III’s ISO performance and, connected to that, how is its exposure recovery?ĭom from LensProToGo happened to do those exact tests by pushing the limits of the a7S III. The only thing about the camera that wasn’t too surprising is that it still takes the crown to low-light shooting thanks to a relatively low resolution 12MP full-frame BSI sensor. Sony’s long-awaited a7S III is still capturing the attention of filmmakers today, many months after its initial release.
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