Rainbow-like Moire?

[adde]

Thank god I'm not alone with that problem. Popped out on my last shoot, not only on highlights the rainbow comes out dancing, no matter what lens I use. Thought it's a fault only on my unit, but obviously not. To me not acceptable! Hope there will be a solution from the Canon.

It´s easy to reproduce i.e. by taking a look at you record collection. Hit the magnifier button e voila. Tried different filters, Tiffen ND´s and Schneider Circ. and Lin. Polfilters, various settings, frame rates. Nothing helped. Best setting seems indeed CP8, sharpness dialed down -10. The shorter the focal length the more rainbow I get (tested 16-35L & 24-70L Canon glass) Ugly.

 

[Michael Palmieri]

the issue is not chromatic aberration. it is another problem entirely. if i had a dollar for every time i heard this comment, i'd be able to buy an alexa.

 

[Ulisse]

Hi,
The following link shows an example of a kind of rainbow moire pattern I shot the other day on the C300 while conducting some lens tests. I've been shooting with the camera constantly under numerous less-than-favorable conditions and this is the only instance where I've seen this problem occur, so please treat this as a very unique case-study. But this may be something to be aware of in case you decide to bring this camera into a space with a lot of stained glass, like a church.

The rainbow pattern that emerged is not the result of my ISO settings, my user settings, or anything else, but I do believe it's something that the sensor is doing. The footage was shot using Canon Raw (user settings totally disabled), utilizing multiple ISOs, multiple lenses, multiple ND settings, imported as Prores or MXF, all with the same results, which is the sort of localized rainbow moire pattern in certain areas. My hunch is that it has something to do with the quality of light coming through a stained glass window directly behind what I was shooting, but that is just a non-scientific hunch and nothing more. One other thing: NONE OF THIS SHOWED UP ON THE MONITORS AS I WAS SHOOTING IT. And I tried it on both the Canon c300 monitor and a separate SDI Monitor just to be sure it wasn't the resolution of the c300 monitor that I was up against.

The file is 35 meg, it was converted to h264 for viewing purposes but this pattern in the video is NOT an artifact of that compression. Showing this on vimeo doesn't make it as clear as what I'm seeing off the camera in its raw state so I had to post it this way instead.

Anyone have any ideas? Anyone experienced this before? It's quite a difficult if not impossible thing to remove in post, so this is why I'm asking.

Thanks, Mike

http://michaelpalmie...ainbowMoire.mov

I see on my C300 too, this a cromatic aberration,found it when you have overexpose area and undersxpose in the same frame, in my case was with 24-70 Canon lens.