Again, how do you measure Native Gamma using Spyder2 Pro? You seem to be using it and that's exactly what I'm trying to achieve right now.
Here - put this into your \Colorvision\Spyder\Targets -folder:
... and calibrate using that as a target. It's D65 G1.00. Edit:
Or, with the Pro version I guess you can make it manually too?Edit Part II:
OR: Are you referring to the 2.5 gamma? You really don't need to measure it - it's a standard measure for CRTs. Engineering tweaks. You can safely calibrate your monitor to 2.2 to have it ready for sRGB or AdobeRGB.