Eric Coughlin
Veteran
The C100 is rated at 12 stops of dynamic range (I've also heard the number 13 mentioned); is this only in Canon Log mode? What is the dynamic range in other profiles?
C100: Dynamic Range differences between Profiles
- Thread starter Eric Coughlin
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AndreeOnline
Veteran
It's rated at 12 stops for Canon Log and Wide DR.
The difference being that in Wide DR your black levels start at actual black (Canon Log has a black level setup at IRE 7.3) and that the Wide DR profile is steeper, providing a brighter image with less of the code values devoted to highlight protection.
Canon Log has significant roll off, but it also means you get a "dark flat" image that might have to be lifted in post, generating more noise.
Both Canon Log and Wide DR have 800% exposure latitude. I think going with another profile gives you about 300% or so. Not quite sure though.
The difference being that in Wide DR your black levels start at actual black (Canon Log has a black level setup at IRE 7.3) and that the Wide DR profile is steeper, providing a brighter image with less of the code values devoted to highlight protection.
Canon Log has significant roll off, but it also means you get a "dark flat" image that might have to be lifted in post, generating more noise.
Both Canon Log and Wide DR have 800% exposure latitude. I think going with another profile gives you about 300% or so. Not quite sure though.
Eric Coughlin
Veteran
Thanks for the info. Can you (or someone) explain exposure latitude in regards to the percentages you stated? I'm familiar with stops of light, but not with % in regards to latitude.
100pct is the exposure latitude in linar contrast ratio (500:1) when you use normal gamma (ITU R 709) without knee. 300pct is the exposure latitude in linar contrast ratio (1500:1) when you use normal gamma with knee (90-95pct) or cine1 gamma. 800pct is the exposure latitude in linar contrast ratio (4000:1) when you use canon-log gamma. This linear contrast ratio you find before A/D converter in CMOS chip (as the scale of black-grey-white tonal gradation), after conversion to digital signal RGB (or YCC) is the gamma curve applied so signal is no more linear. Also A/D converter of the C100/C300 can be a non-linear, as Alan Roberts said in his test of the C300 on page 14/15 ( http://thebrownings.name/WHP034/pdf/WHP034-ADD70_Canon_EOS_C300.pdf page 15 at top)
Try set exposure to "just without overexposure" at ISO850 with canon-log and change ISO to 320 and gamma to cine1 - withnout changing exposure (ND, shutterspeed, aperture and amount of light). Look to WF monitor...
In this test of the C100 below I left some small "headroom" in exposure, but it is right this type of test.
https://vimeo.com/67939867
Try set exposure to "just without overexposure" at ISO850 with canon-log and change ISO to 320 and gamma to cine1 - withnout changing exposure (ND, shutterspeed, aperture and amount of light). Look to WF monitor...
In this test of the C100 below I left some small "headroom" in exposure, but it is right this type of test.
https://vimeo.com/67939867
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