I have the 50S20B and I am very happy with it, I have noticed no posterization, rising black levels or the 3 Centre lines on quick pans when veiwing HD footie.
I managed to get mine for £ 749.99 a while back and it was a bargian at that price.
In terms of Posterization, see the quote below:
Temporal posterization is the
visual effect of reducing the
number of frames of
video, while not reducing the speed at which it actually plays. This compares to regular posterization, where the number of individual color variations is reduced, while the overall range of colors is not. The motion effect is similar to the effect of a flashing strobe light, but without the contrast of bright and dark. Unlike a
pulldown, the unused frames are simply discarded, and it is intended to be apparent (longer than the
persistence of vision that
video and
motion pictures normally depend on). The effect is available in
After Effects and other
motion graphics and
video editing software.
[1] An
animated GIF often looks posterized because of its normally-low frame rate.
More formally, this is
downsampling in the time dimension, as it is reducing the resolution (precision of the
input), not the bit rate (precision of the
output, as in posterization).
The resulting stop-go motion is a temporal form of
jaggies; formally, a form of
aliasing. This effect may be the intention, but to reduce the frame rate without introducing this effect, one may use
temporal anti-aliasing, which yields
motion blur.
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