Understanding New Varicam 4K Dual ISO
- Thread starter lumpyramy
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Ebrahim Saadawi
Carbonite Member
I'd like to know too.
Does it mean there's exactly the same amount of DR, the same colour tonality, the same noise amount, as it is at 800 vs 5000?
And what's the difference brtween this and a very good lowlight performer say a C300 (not to mention the mk II) which at 5000 looks nearly as clean as 800 and works even up to 20.000 with clean results,.
I mean what's the gain here that we get from being restricted to these two ISO values compares a good lowlight performing camera from like a C300 of an F5/55.
Does it mean there's exactly the same amount of DR, the same colour tonality, the same noise amount, as it is at 800 vs 5000?
And what's the difference brtween this and a very good lowlight performer say a C300 (not to mention the mk II) which at 5000 looks nearly as clean as 800 and works even up to 20.000 with clean results,.
I mean what's the gain here that we get from being restricted to these two ISO values compares a good lowlight performing camera from like a C300 of an F5/55.
jm.gardiner
Well-known member
My understanding is that they designed the sensor with half the photosites tuned to a native 800 ISO and the other half tuned to a native 5000 ISO.
Which oddly makes 5000 iso cleaner than say 3200. It's not a noise free image, but they say the 14stops is consistent at both 800 and 5000.
http://blog.abelcine.com/2015/01/05/a-tour-of-the-panasonic-varicam-35-hs/
3 minutes into second video he talks about the ISO's
Which oddly makes 5000 iso cleaner than say 3200. It's not a noise free image, but they say the 14stops is consistent at both 800 and 5000.
http://blog.abelcine.com/2015/01/05/a-tour-of-the-panasonic-varicam-35-hs/
3 minutes into second video he talks about the ISO's
Ebrahim Saadawi
Carbonite Member
What does half the sensor tuned mean? wouldn't that require cutting the resolution in half to shoot at 800/5000? Or do they perform some kind of merging trick of two exposures like the dual-path architecture from arri or the new c300?
jm.gardiner
Well-known member
Exactly, they're merged not thrown away. The 800iso tuned photosites should keep the 5000iso exposure clean in the shadows and vice versa with the highlights othe way.
I think companies are discovering better ways to process the info coming off these sensors. Much like how Arri was able to squeeze out so much DR from it's sensor. The new C300mk2 is rumored to have increased dynamic range because the image is fed through two different processors at different iso levels.
I think companies are discovering better ways to process the info coming off these sensors. Much like how Arri was able to squeeze out so much DR from it's sensor. The new C300mk2 is rumored to have increased dynamic range because the image is fed through two different processors at different iso levels.
