Originally Posted by Nudgiator
I am a little bit confused. The RS50/60 are using the same CMS for gamma / grayscale. But I have never heard anything about problems with the internal controlers. I know that there is still a problem with the gamut controlers of the RS50/60: if you use the internal gamut controlers of the RS50/60 "too much", you will loose the linearity of the gamut. The only solution at the moment is to use the CMS of an external video processor like the Radiance.
Thanks, but I am VERY familiar with all these informations. I am running the calibration thread for the rs50/60 on AV Forums and investigated these in details very early.
The rs50/60 do not have the same CMS as the rs40, as it is very limited on the rs40 and is only accessible in the service menu. The rs50/60 have a full internal CMs which doesn't track saturation properly, but it is possible to get excellent results with it if you know what you are doing and are NOT targetting rec-709 in order to get it. It is true that it is less easy than using an external processor like the lumagen. You need to aim for a slightly oversaturated gamut at 100% Sat in order to compensate for the undersaturation at 75% sat, which is not easy to do but again gives very satisfying results visually, which explains why rs50/60 users can be happy in this area when the unit has been calibrated by a competent calibrator.
The issues with the cms and gamma controls have been confirmed by Phil Hinton in his review of the x7 on av forums and aknowledged by JVC, who promised a fix a while ago, so it's pretty common knowledge.
The issue with the gamma controls on the rs50/60 are probably due to the fact that they are handled by the genessa chip in charge of the cms, 3d and gamma, which is not present on the rs40.
You should read the calibration thread on av-forums and the multi-part review of the x series from Ekkeheart at cine4home if you are interested in this.
In any case, I'm glad to hear that the rs40 doesn't have the gamma issues of its older siblings, thanks for the information.