Originally Posted by Light Illusion
The pre-Jan 2017 i1D3 probe are not guaranteed over 1000 nits...
The post-Jan 2017 are.
With pre-Jan 2017 probes you will get readings well over 1000 nits.
I think the highest reading I saw way something like 2300nits. I didn't want to stick it any closer so gave up there.
Of course this just raises more questions in what seems like a bit of an unclear soup...
From what I've seen in the marketing for the probe from some source (http://www.vpixx.com/datasheets/ds_i1display_pro.pdf
) - very little useful data really out there:
• Luminance Measurement Range: 0.1 cd/m2 to 1,000 cd/m2
• Minimum measurement integration time: 0.1 sec / measurement @ 100 cd/m2
• Maximum measurement integration time: 6 sec / measurement @ 0.10 cd/m2
• Accuracy: Illuminant A under X-Rite’s standard measurement conditions
o Color = ± 0.004 x, y @ 100 cd/m2
o Luminance = ± 4.0% @ 100 cd/m2
• Short-term repeatability: Illuminant A under X-Rite’s standard measurement conditions
o Color = ± 0.001 x, y @ 100 cd/m2
o Luminance = ± 1.0% @ 100 cd/m2
And your own website:
Luma Measurement range: 0.1 to 2000 cd/m2
Luma Accuracy: +/- 4% (@ 100 cd/m2)
Chroma Accuracy: +/- 0.004 (@ 100 cn
/m2) (typo there I guess)
None of these specifications described how well the probe is/was expected to perform at 1000/2000 nits, nor it would appear should you expect any readings of use below 0.1cd/m2.
If there is a probe which is rev B retail / OEM pre Jan 2017 that is reading values over 1000 nits, on what scale are these values considered "worse" than values at 1000 nits (is there any data for what the accuracy looked like across the respective measurement ranges pre- and post- OEM Jan 2017 changes?).
The (very cynical) in me looks to my sphere of understanding - the world of electronics design. When looking at part datasheets you'd expect to see charts showing these parameters plotted, with the numbers and statements listed above just forming the "top line marketing" of the product to trap people who don't bother to read any further, but in this case it seems all we have to go on. The charts in the data sheets would usually show for a part marketed as above that the performance wasn't what you'd really like across the range.
Have you seen charts that express the accuracy of these meters over the stated range - and what is the change to this between the different revisions of meter? Have you or are you aware of anyone testing rev A / B preJan2017 / B postJan2017 probes against another probe which has better specified and understood ranges of performance?
I actually care very little for HDR, being into projection. My biggest concern is that in the absence of any hard data to the contrary, x-rite on their current specification could have significantly hampered the low end performance of their probes to gain the extra headroom and still be well within their very limited public spec.