Originally Posted by cleeve
I'm having some pretty darn noticeable motion-judder issues with my 600M.
It seems to be most prevalent in Blu-rays, but I've certainly noticed it in other circumstances as well.
It's just a very noticeable 'judder' in slow pans and such. For example, in a left-to-right pan, it's as if the moving images seem to shift to the right, and the back to the left, in very very small increments, every millisecond, over and over again, until the pan is done.
I'm fairly confident what you are seeing is normal. It's called low-motion judder, and it's attributable to the native 24p sampling rate used for Hollywood motion pictures. Put simply, 24 frame/s is just not sufficient for capturing and playing back all speeds of motion cleanly.
During very slow camera pans, everything will look normal and smooth. However, speed the pan up, and the motion judder becomes very visible (especially on a 60'' display). I have seen this in several Blu-rays: Wall-E, and Serenity which I just watched earlier this week.
You may have never seen this type of judder previously because you were watching telecined material (24p-->60Hz). Telecine judder is still noticeable, but some would argue not as bad as motion judder from native 24p playback. The mastering studios also apply blur to simulate fluidity of motion. However, oftentimes it's not enough to cover up the judder from various panning motions.
The Kuros do not have any features which can compensate for this that I'm aware of, unlike LCDs which have MCFI and BS techniques to "upgrade" the 24p rate to appear as smooth as 50/60p content. The majority of videophiles and film purists despise this LCD trickery and prefer to leave it disabled. Panasonic also includes their own version of MCFI on their plasma line, titled IFC. But again, many avoid these features for film content.
So right now, there is no way to completely eliminate all forms of judder, while also avoiding the infamous "smooth video look." The absolute best way to compensate for these things is to increase the sampling rate of the source.
This is one reason why James Cameron is promoting 48p, and also because judder is more perceptible in 3D imagery than 2D.