C100: When to use ISOs below 850

I think C-Log isn't the best option for shooting to AVCHD, so the Wide DR gamma was introduced on C100 for this purpose. I will check the Cine 1 gamma and see.
 
FFoxX and Pave1, I just want to thank you guys and encourage you to do further testing!
(You guys seem to have an engineering background, is that right?)
Anyways, as I understand most custom picture profiles C100 users use, are actually C300 profiles.
All C100 owners probably bought the camera telling themselves "It's the same sensor!" and "AVCHD is a very efficient codec!" and "Both are 8bit!".
Well, I did ;)
While this is all true, I think it´s wishful thinking, the C100 will just "be" a C300, given the same PP parameters.
So maybe as FFoxX said, "C-Log isn't the best option for shooting to AVCHD, so the Wide DR gamma was introduced on C100", is sth the C100 community really needs to look into further.
 
Spartacus - Thanks. I have fifteen years experience of work in broadcast TV at postproduction (Avid MC and Avid DS including cooperation with Baselight).
Shooting is my small personal business that I enjoy.

C100 is wonderfull camera, but the AVCHD record does not like noise (an external recorder can help). I personally select cine1 gamma curve for the most of work (it has the best colors) with basic ISO320, WDR with basic ISO320 for some special lightning (I still learne a correct exposure for WDR gamma, where I need to do some underexposure for correct result).
Camcorders are only the tools and technology is changing.
 
FFoxX said:
My english is not perfect too, I would write in czech, but I want also others to understand.

So when using other than C-Log gamma, lowering ISO is better than using ND filters, with C-Log gamma ND filters are better.

Problem with noise in compression codecs is, that the noise is low level signal component consisting of high number of frequencies, so it is the first part of picture that is decimated by codec quantization. AVCHD uses reference frames, so the noise could be partialy reconstructed using data from that reference frames, but only in spatial domain, not in time domain, resulting in the so called "mosquito noise" which is not so apparent on single frames but much more in playback. In MPEG2 or MJPEG codecs blocking appears instead of mosquito noise. But the camera noise could be efficiently masked by adding the right amount of film grain.
Click to expand...

Thanks!
 
Pave1 said:
I personally select cine1 gamma curve for the most of work (it has the best colors) with basic ISO320, WDR with basic ISO320 for some special lighting (I still learn a correct exposure for WDR gamma, where I need to do some underexposure for correct result).
Click to expand...

I have done some tests in bright sunlight, and the Wide DR gamma with ISO 400 delivers best results for me.

This is my first video shot on C100, using Wide DR and graded with levels, curves, color matrix and color correctors: https://vimeo.com/68489514
 
FFoxX - colors looks ok. Which color matrix did you used - WDR matrix?

I also try a WDR gamma, but first part I shoot very quickly after my arrival and my color correction in this part are also not really correct .-) .
After 5th minute it is beter (but it is only "a quick handled work...") - https://vimeo.com/69702005

In the second half I used a samyang 24mm/f1,5 glass (exposure at F2.0 for better sharpness) at evening with cine1 or normal4 gamma (ISO about 4000 or sometime higher), it was excelent lowlight.

But cine1 has still better blue-cyan-yellow colors:
http://www.videoproduce.cz/images/002_c100_50mm_cine1_gamma.tif cine1 gamma
http://www.videoproduce.cz/images/003_c100_50mm_WDR_gamma.tif WDR gamma
http://www.videoproduce.cz/images/004_c100_50mm_b_yellow_secondary_correction.tif WDR gamma with secondary color correction (yellow)
 
Last edited:
You must log in or register to reply here.
Back
Top