problem with grain with HVX200 + sgpro

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xha1dude

Active member
Shot image movie with hvx200 + sgpro rev 3
0db gain, 720/50p aperture between 0-4
we had a lot of problems with gain, in dark areas as in bright areas.
any idea whats the problem?
camera or adaptor?

shot a music video with the xha1 2 months ago, there was everything ok!


example:

http://www.oneshot-tv.de/grain.mp4
 
Wow, I've watched it 10 times now and I can't see it. It may just be camera noise.

If it's grain from the adapter, it would be in a semi-circular patern and really visible against a light background like those curtains. If that's what your seeing (and again, I don't see it), that's typically caused by stopping the 35mm lens down too much. Spinning adapters like the SGPro typically can stop down a fair amount before you see grain. I shot a bright blue sky with my SGBlade with the 35mm lens stopped down to f8 and didn't see any grain.
 
converting to h246 is basically like chucking a grain removal filter on your footage..... i couldn't see anything either. at least nothing that didn't look like normal video noise. it looked quite good actually. nice and filmic :)

what was your lighting setup?
 
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yeah it is really not so much grain like in the original footage!

i will upload another file soon,

we had much lighting because we had to shoot against the windows

we had 3 x arri 800
2 x 4bank 120 cm
1 x 200 arri daylight and 1x 575 arri daylight
 
I agree with xha1 dude. If you notice there is a lot of grain in his hair. And to top it off he shot it during the day with a lot of lighting. Which isnt like shooting during night with low lights. I would like clarification on issue because i ve encountered it myself.
 
here's my theory on it....

the the SGpro shouldn't make the footage grainier coz it's a spinner right. but i think it just makes normal video noise more obvious.

normal video noise is usually hidden by fine/high frequency detail. but as soon as you have smooth soft details, like out of focus/soft focus areas and given the picture you're now capturing is less resolution, the normal (always there!) grain stands out more.

and the HVX is a noisy camera in the first place... the SGpro just makes it more obvious

or something like that :)
 
actually that explanation makes a lot of sense. can anyone confirm his theory on the grain?
 
Ah, now I see what you're talking about. That's definately not grain from the adapter's GG. It looks like noise from the camera, to me.
 
xha1dude said:
any ideas how to reduce it?
Click to expand...

The noise reduction software, like Neatvideo, could help. Telling truth I don't consider the noise level in your footage excessive. Maybe this is because I got used to it (I've been Panasonic user for long time) :)
I asked about the gamma curve, because some people reported increased noise in the shadoes when using Cinelike D gamma.
 
i just used after effects noise reduction for a small test, works good, but takes 30 minutes rendering for this 15 sec clip!
 
I agree, the noise in your video is not excessive. I've used the NeatVideo plug in. It is excellent and does some amazing stuff. I think it's $99 for the HD version.
 
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