Originally posted by karl79 the aliasing/moire issues make it unusable for me
I wouldn't go this far. Of course, I don't know your requirements.
On the positive side is the outstanding fine detail contrast, on the negative side is the moiré issue. Two sides of one medal, actually. This is most visible with high contrast fine detail like the runway in the above video (or text, usually).
There are gray filters to reduce the effect (basically, a plate with many little holes) which create disks of confusion (by diffraction or refraction) about the size of one pixel in video mode). A slight explicit defocus helps as well (may require mild sharpening in video editing).
INVENTION
A gray anti alias video filter can be self made like this:
1. Place a large number of screws, head down, onto an UV filter.
2. Paint the remaining part black (use spray).
3. Remove the screws and let dry.
The diameter of the screw head should be such that one Airy disk roughly covers one pixel in video.
A. Airy disk radius for screw head with diameter D: r = 1.22 * 0.555 µm * f / D
(f is the lens focal length, green light)
B: r = 1.5 * pixel pitch = 1.5 * 5.5µm * 4288/1280
(pitch of video pixels, 50% overlap)
=> D ~= f/40.8 or 0.44mm for a 18mm lens
Note that one could approximate the effect by using f/32 in bright sunshine.
It may be difficult to obtain and handle screws this tiny. Here are steel balls this small and can be used if spray is applied from a constant angle:
http://www.nanoball.de/de/component/virtuemart/?page=shop.product_details&fl...&category_id=2
Also, one can print out the pattern on transparency sheet. There are special zone plate inspired hole patterns for this purpose (as the holes must not be too dense).
Last edited by falconeye; 11-02-2009 at 09:33 AM.