C100: Crazy Moiré on a C100 mk1

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drummondb

Well-known member
Will you guys check out these screen grabs? Never seen moiré this bad on a C100. Shooting on a mk1 with the 24-105 lens in 24p

I was using a profile we use for live stream when we can't do any color grading after the fact. It's a rec709 profile with sharpness at -5. I know many people (including myself) would like to always use -10 sharpness, but as I say, this is for footage that has to go out live as-is.

First image is from early in the segment. My boss is alone n a medium shot with his suit on. Second image shows a bit later when he is joined by another guy. And in image three he's back by himself in a similar shot to #1, but now there' the crazy moiré on his jacket.

Did this C100 just have a a stroke?

https://postimg.org/gallery/20qmkd7js/
 
You always have to check. some fabric patterns have a special sauce that can't be beat! Tight small grid patterns are a problem for some of the best cameras. Try to get them to bring at least 2 options for clothing.
 
thekreative said:
You always have to check. some fabric patterns have a special sauce that can't be beat! Tight small grid patterns are a problem for some of the best cameras. Try to get them to bring at least 2 options for clothing.
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Exactly - hmm... I see moire - well let's not shoot that - next
 
The thing is - the tightness of the pattern may or may not cause moire, depending on how close or how magnified it is! So look at drummondb's images -- the first two look just fine. The third image is outrageously moire'd. Same guy, same jacket, same set, but two extremely different results. The thing is, the guy probably walked just a little bit closer to the camera, or just a bit further away, or you maybe changed focus just a bit, to where the pattern in the jacket lined up with the pixels on the sensor in just the wrong way.

What I'm saying is -- you can't just test it and say "yes, this is good" because if the guy steps just a few feet further away, exactly what happened here could happen again. If you're using a camera that has a too-tightly-set OLPF (or no OLPF at all!) then you constantly have to be vigilant for seeing if this is happening. And the only way to know is to be watching on a pixel-for-pixel monitor (so if shooting 1080p, you have to be watching on a native 1080p monitor). You cannot tell off the camera's LCD. And if you see moire, about the only thing you can do is back off focus a little until it goes away.
 
It's just a bit surprising to me because I've used several c100's, both mk 1's and 2's, almost every day since 2012, and I've never seen moire that bad. I barely ever see it at all. Just seems odd to suddenly go from zero to 11 in one fell swoop.
 
I've never had it as bad on your #3 on my C100, had it on other cameras and as Barry said I could zoom out or in a little and it would disappear.

However, clients are driven by content and often when you show them something and don't mention it, they won't notice because they are fixated on the face and listening intently to the audio messaging.

But please do this: I have had moire with the C100 on bricks, mosaic tiles, etc. on my 27" iMac and started freaking out but by the time I exported and watched it on other screens it had disappeared. So let us know if it's there after exporting.

Ned
 
Softening the image in post, on set, or via export (such as if you deliver in 720 or low bit rate), are various ways of reducing or eliminating moire. Or having them change shirts (though sometimes that's their favorite shirt), or having the brick building rebuilt out of concrete.
 
nedcam said:
I've never had it as bad on your #3 on my C100, had it on other cameras and as Barry said I could zoom out or in a little and it would disappear.

However, clients are driven by content and often when you show them something and don't mention it, they won't notice because they are fixated on the face and listening intently to the audio messaging.

But please do this: I have had moire with the C100 on bricks, mosaic tiles, etc. on my 27" iMac and started freaking out but by the time I exported and watched it on other screens it had disappeared. So let us know if it's there after exporting.
Ned
Click to expand...

My exact same experiences, except I was seeing it on my 15" macbook retina. After exporting I played the video on my tv and on my phone and there wasn't any moire present.
 
Reggie Brown said:
My exact same experiences, except I was seeing it on my 15" macbook retina. After exporting I played the video on my tv and on my phone and there wasn't any moire present.
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Unless you're watching it at 100% resolution, or pixel for pixel, then all bets are off as to whether that moire is in the footage or in the playback scaling.
 
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