URGENT:filming LED walls MOIRE

[oliver imfeld]

i need to shoot a scene where there's a huge LED wall in the background; as soon as camera moves, we get moiré; any clue on how to avoid this ?

all advice welcome, thx !

 

[Matthew Riggieri]

I have done the same before. You either need to put it slightly out of focus or try a diffusion filter, like a classic soft

 

[Björn Benckert]

Had the same problem as well... it ended up with a post solution where we digitally replaced the led screens. So one ide might be to shoot the screen and it's content with a fixed cam / almost full frame and then let the post guys replace it.

 

[oliver imfeld]

thx guys,

will do.
cheers
o

 

[Christopher Probst]

Use a zoom lens if you can, and you can zoom in or out and watch the moire swing in and back out again through different harmonics of the sample frequency... Pick a focal length on the zoom where the moire is the least offensive and then try cracking the focus off razor sharp a tad. (If a zoom is too slow, aperturewise, moving a fixed focal length further away or close would do the same thing, just more a pain in the ass..

Then if you have the option to recomp the LED back in during post like Bjorn said, even better.

 

[John Marchant]

As Christopher says, a zoom is invaluable for hiding this kind of moire, tiny adjustments have a big effect. The other significant point is to check for moire at your delivery resolution, not to go by eye on the LCD or an HD monitor. If you see it there, its bad of course, but often its there without your knowledge too.

Just recently shot some product material for an interactive table and screen for kids... moire hell

 

[ericyoung]

John makes very good points.

Also make sure your monitors don't have excessive sharpening or focus assist modes turned on - this can give a false sense of the amount of moire.