the only reason i ask is i have done a bit of research and it seemed to be a bit of a 50/50 split as to wether it is a 50 or 100, I jnow it has motion flow bit sony don't specify the native start point.
Most manufacturers arnt stating the native rate these days, which is a shame. Its all about numbers these days, similar to the Mhz/Ghz wars of AMD/Intel of a few years ago
