I'm shooting a 2D animation (frame x frame under camera) using a Canon T31 with the standard kit lens capturing with Dragonframe. I keep on getting moire patterns (pink and green diagonal lines) showing up in my captured images (also visible on the screen as I adjust focus). The patterns disappear when I am out of focus and reappear when in focus.
My backgrounds are manipulated images culled from the net and books. The images are printed on microfiche paper in black and white with areas that are hand coloured. There is a slight gloss on the paper from the printing. The moire is not visible on the printed images so it's something about how the camera/camera's sensor is picking it up.
I've tried adjusting the height of the camera and using the optical zoom, adjusting the light, using a polarizer, taking off the polarizer... all no dice. The moire pattern also shows up when I shoot still shots not using dragon frame.
How do I get rid of the moire?
That's an odd scene to be getting moire; I wonder if it's the dot pattern of the printer causing it? You get moire from very fine repeating patterns, and the forest scene itself isn't remotely that.
What's the resolution of the final product going to be? Unless you really need the full 5K resolution in the final copy, you're going to lose some detail when you export down anyway -- it might not hurt to move that loss of detail to a slightly out of focus shot (or a lower dpi print), if that removes the banding from the image. Maybe try a few test stills -- compare an in-focus, full resolution print shot to a shot just barely out of focus enough to remove the banding, and to some in-focus shots with various levels of lower resolution prints, and check if you can see a drop in quality between the images after they've all been down-res'd to something like 1920x1080.
I would try a different lens. Preferably a prime (not a zoom) and one that's known to have good sharpness and no chromatic aberration. A cheap camera with a good lens can get really good images, but even the best camera with a bad lens can't. You might also try looking up the lens (manufacturer, focal length range, f-stop should be enough to ID it) and read reviews on it. A lot of kit lenses are real stinkers.
Ok, moire is really a new one on me - not something I've had to deal with or look into before, apparently it isn't a lens thing but a sensor thing as you said originally. Here's a page with a lot of really in-depth explanations concerning it and possible solutions: What is Moire? How can we avoid it? I've read a bit of it, and one thing that occurs is you might try not doing any sharpening of the images in post, or even turn down any sharpening that's being applied.It might even be necessary to turn Detail or something with a similar name down to below 0. It's just a suggestion off the top of my head- I don't claim to actually know anything about this subject.
I think the moire comes from a clash between the pixels on the sensors and a fine repeating pattern on the subject. They are too close to the same size I believe. Striped shirts could cause it in television broadcasts. In this case I suspect it is the dots that make up the printed image, it's the only thing I can think of. I've had similar weird things come up when scanning printed images. The scanner has a setting to get rid of it, but I don't suppose a camera does. I wonder if shooting at a different resolution would change the stripes at all?