This image was taken with a 5D Mark II pointing at an LCD
monitor screen displaying horizontal white lines. The lines
are white, one pixel thick, and spaced 5 pixels apart (four
black lines between each pair).
I was experimenting with methods to reduce this aliasing
using devices in between the camera and the subject. One of
these devices was simply a number of strands of black string,
spaced evenly to create a diffraction pattern. I recorded
video, and as soon as I removed the string, this pattern
appeared. It looks like the familiar maze-like demosaicing
pattern frequently encountered when the signal frequency
is close to Nyquist.
What's interesting to me is the distribution of red and green
with respect to the distribution of blue and green. I'd expect
them to be similar, but they are not. I also notice something
else.
In addition to the horizontal banding that's obvious, there
is vertical banding, bands of sharp vs. soft. I'm not quite
sure what to make of it, yet.
The lens used was a 135mm f/2 lens. Subject distance is about
15 feet +/- less than a foot. The monitor is a Syncmaster XL20.