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EOS C70 output problem

electric_sun
Apprentice

I have a problem with the output signal via HDMI and the stored data only at C-log2 and C-log3.

Prerequisites: All devices and programs are on the current firmware. If the LUT were measured, the WFM would look different!

When I connect my smallHD to the C70, I see a complete difference in the WFM: In the highlights and shadows, the WFM is cut off at various points.

r/cinematography - To all Canon EOS C70 owners and users  Fig. 1 (WFM white samllHD, WFM green C70 on samllHD)r/cinematography - To all Canon EOS C70 owners and users Fig. 1 (WFM white samllHD, WFM green C70 on samllHD)Fig. 1 (WFM white samllHD, WFM green C70 on samllHD)

When I open the associated file in Davinci, the WFM looks like this:

2.bild.pngFig. 2 Davinci

Summary overexposure    

WFM samllHD  WFM DavinciWFM C70
85IRE85IREapprox. 92IRE

 

And in the shadows there is also a clear difference. The picture is unfortunately not quite clear, but I hope for you meaningful enough.

Bild3.JPGFig. 3 (WFM white samllHD, WFM green C70 on samllHD)

 

4.Bild.pngFig. 4 Davinci

 

Summary underexposure

WFM samllHDWFM DavinciWFM C70
approx. 9IREapprox. 9IREapprox. 3IRE

 

Then there is also the fact that the mids are not identical. Please compare in figure 3 the brightest part of the picture around the 60IRE. There is also a shift. When I turn on False Color on the C70 and on the smallHD, the mids are clearly not in the same place.

Can someone please check this on their C70 to see if it's the same there?

I also did the test with an Atomos Ninja. It is not meaningful for me as a reference monitor, because it displays the same as the C70. So it's best to compare the WFM from the C70 with the one from Davinci!

I trust Davinci more than I trust the C70.

I would be very happy if someone can help me. I am a bit at a loss.

3 REPLIES 3

shadowsports
Elite

Have forwarded this thread to rs-eos (ricky) to see if he has anything to add.

~Rick
Bay Area - CA


~R5 C (1.0.2.1) ~RF Trinity, ~RF 100~400, +Canon Control Ring

~6D2 (v1.1.1) Retiring ~EF Trinity, others ~DxO PhotoLab Elite ~Windows10/11 Pro ~EVGA RTX 3080Ti FTW3 Ultra ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It

Thank you!

rs-eos
Authority

I saw this thread, but I don't use any external recorders.  Thus have not used the HDMI output.

Having said that, no that I looked again, I believe CLog2 vs CLog3 does have different values to where it wants 50% gray to be.  I only use CLog2, so on the internal waveform, I try to get as close to that as possible.  Or, to use false color.

--
Ricky

EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L, 600EX-RT (x6), ST-E3-RT
EOS C70, RF 24-70 f/2.8L IS, EF-EOS R 0.71x
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