Originally Posted by Vinny VIn
i posted some comments in that hd guru Panny article, and HD guru responded , kinda interesting. I signed up here to share with you guys.
The Trichomat-1 is a tri-stimulus contact probe. I am not aware of any of these types of products having a luminance accuracy of under .05 ft. lamberts (and many are only accurate to .1 ft lamberts).
As for all TVs using the same panels, Panasonic calls the VT30 model an infinite black pro 2 panel, while the GT is infinite black. Regardless of how they are achieving claimed deeper blacks, the proof will be in measuring with a meter with better light level accuracy (than a tri-stimulus contact probe) to determine the actual black level. When we get ourhands on a production sample I will make my readings and report them.
My subjective look at the VT30 at CES and at the line show tells me its quite deep. FYI, I place my hands over the screen where there is black content to form a tube to block out as much of the ambient light as possible and then place my eye over my hands. Completely subjective, though one can see how much residual glow there is on the panel. The only way to really know black level is to measure in a dark room with a sensitive, accurate instrument.
Yeah, yeah, yeah, another ignorant slam on my meter. I say ignorant because I can prove
it's ignorant; I'm not just calling people names.
The Trichromat-1 is rated by the manufacturer to read accurate color down to .05 cd/m2, which when converted to fL is .0146. And with luminance being easier to read than color, it's accurate below that number for measuring blacks. Someone else here on the form made a similar judgement about a D2 meter not being able to measure the black of a PK550 plasma. This is his statement and D-Nice's answer:
I don't think you can trust anything the i1D2 tells you when measuring much less than 0.4 or 0.5 fL. You'll get a measurement, it just doesn't necessarily have much to do with reality.
The D2 is quite capable of accurately measuring luminance (including the minimum luminance level) on a PK550. No one said anything about the accuracy of RGB xy below 0.01fL
In other words, yes, the color accuracy of the meter is going to stray below it's rated range, but it can still be perfectly capable of giving a reasonably accurate luminance reading quite a ways below that.
I also own a Chroma5 which is also rated down to .05 cd/m2. However, it starts to give junk readings much below it's rated range. I don't know exactly where it's cutoff is, but I know if I tried to measure a display that was .004 or so it'd come back with some ridiculous number. So not all meters are created equally, even ones rated down to the same levels.
BTW, I also measured the blacks of the 2010 G25 at .0083, which is within experimental error of their measurement of .008, which I suppose was taken with their expensive Minolta meter..