@Barney Fife: wow what a long post, lets see if i can beat that
Currently the Spyder is not with me, so i can't test it. But as soon as it comes back and i have time , I'll play a bit with it.
Only 100 adjustment is not too bad, if it does really do something every step
What do you mean with, how do they look to me on my monitor? They look quite okay for me, but honestly for good eye calibration i need the right patterns, e.g. comparing different whites and choose the most neutral.
About the DVD as spectroscope, i bought a cheap hand held toy spectroscope, thats not bad to see spectral lines as well ... you can see the extra spectral line of white color gamut displays with it
About the accuracy of various color calibration tools, i am a bit confused. I was so naive and thought that these colorimeters have color filters closely matching the spectral sensitivity of the CIE1931 observer. Thus i thought they should be able to measure all by human perceivable colors. Opposed to that the color filters of camera sensors are a compromise between color accuracy and quantum efficiency. So they cannot distinguish all colors. But it seems that these color sensors of the Spyder (and probably other similar cheap devices) are also just a compromise. So they probably need to assume some spectral distribution of the light source which should be calibrated, the LCD attachment of the Spyder is already a hint to this. This explains why the Spyder does not work with wide gamut displays .... Maybe the Spyder3 is better (with 7 color filters), but i don't want to waste more money. Currently i have the feeling that a Canon camera may be similar effective or even more effective to calibrate LCDs...
Photographing the screen through different known color filters (with known spectral response) would be a cool idea to improve the color accuracy to calibrate monitors
Or i should just photograph the LCD through my cheap spectroscope, but this would need a lot of work to be calibrated to be able to get useful results.
Btw. i have spyder2, and as i said, i have the feeling it is not accurate, because does not work with wide gamut lcds...