With all these new 4K cameras coming out I'm wondering if they'll have reduced moire compared to full HD cameras. It's my understanding that moire arises when the camera sensor cannot accurately resolve fine detail in a shot. So if 4K sensors have more resolving power then shouldn't they make less moire? If true then that's a big asset to shooting 4k.
4K a Moire Killer?
- Thread starter Benjobe
- Start date
Cosimo Bullo
Veteran
Using a D800 for stills and the damned 36 megapixel beast still exhibits it from time to time, so 4k won't be the end, but should be better.
Samuel H
Major Contributor
it should appear less often: with more pixels, the frequencies that trigger moire are higher, and can start to be cancelled by lens softness
it will be easy to test, comparing the BMCC with the BM4K (except for the fact that it will depend on lens and aperture)
it will be easy to test, comparing the BMCC with the BM4K (except for the fact that it will depend on lens and aperture)
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morgan_moore
Major Contributor
Killer Moiree more like!
If you dont have an AA filter them moiree hapens.
It happens at the frequency of the pixel pitch
So with a 2k camera a fine weave suit might go mental at 2meters from the camera (but not 1 or 3) and with a 4k camera the a suit might go nuts at 3m (but not 1 or 2m), but it will happen with any cam when the subject density hits the pixel density.
My ancient Kodak SLRn stills camera was 12mp? - about 4k? Anyway Ill always remember this shot which basically taught me never to buy any camera without an AA filter for use on professional jobs and be extremely sceptical about any cameras that line skip or try any other dumb tricks (DSLR, DSLR-ML, Sony F5/55/700 at 2k etc)
If you dont have an AA filter them moiree hapens.
It happens at the frequency of the pixel pitch
So with a 2k camera a fine weave suit might go mental at 2meters from the camera (but not 1 or 3) and with a 4k camera the a suit might go nuts at 3m (but not 1 or 2m), but it will happen with any cam when the subject density hits the pixel density.
My ancient Kodak SLRn stills camera was 12mp? - about 4k? Anyway Ill always remember this shot which basically taught me never to buy any camera without an AA filter for use on professional jobs and be extremely sceptical about any cameras that line skip or try any other dumb tricks (DSLR, DSLR-ML, Sony F5/55/700 at 2k etc)
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+1000!
Samuel H
Major Contributor
yes, it's just changing the range of frequencies that will produce moire, but those higher frequencies are more likely to be killed by lens softness, which should reduce moire a bit
it will definitely be there with sharp lenses
this is a test showing that if the lens can't resolve the frequencies that make moire appear, it just won't be there
http://www.bmcuser.com/showthread.php?7702-BMPCC-Where-s-the-Moire/page2
it will definitely be there with sharp lenses
this is a test showing that if the lens can't resolve the frequencies that make moire appear, it just won't be there
http://www.bmcuser.com/showthread.php?7702-BMPCC-Where-s-the-Moire/page2
combatentropy
Veteran
moiré mourir?
So there won't be less moire per se, it'll just happen at higher frequencies (tighter patterns)? I do a lot of interviews with my GH3 (sharpness dialed down to -3) and sometimes I get moire from loose knit fabrics. If the GH4K solves that problem for me then I'll be very grateful.
Moire and aliasing are indeed caused by detail finer than the photosite spacing - but in the cameras here most referred to, have a lot more to do with how the sensor is read out in video mode.
Typically, blocks of photosites are read out together as a unit, and hence what is crucial is the relationship between the size of detail and the size of the BLOCK - not the individual photosites. Since the blocks will be bigger than photosites, it follows that moire/aliasing will occur at coarser detail in video mode than in stills mode.