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.
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Here - put this into your \Colorvision\Spyder\Targets -folder:
[a href=\"http://www.loadusfx.net/linear.tgt]http://www.loadusfx.net/linear.tgt[/url]
... 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.