OK Eric, Ill try that tomorrow, but, if you make a CWB with any filter combination and then image using it, it should always look normal. Isnt that the point of the CWB, to compensate for different colour balances, how will that prove which filters are in line ?.
Your pic still doesnt make sense to me, you say the Baader BCF filter has a spike at 1100 (as per the graph) and that is why the pic is redder than my 350D pic with a blocker, but you also said the shaker low pass filter 1 is still there, which has a steep roll off at 700. The spike at 1100 then would be completely eliminated by the low pass filter 1.
I think I have taken out the phaser layer because the red histogram changed enormously after its removal. Also, the leaves are still somewhat green on the 350D pic with just the UV/IR blocker, that to me is fairly conclusive, its a known quantity and very similar to the 40D pic. The shaker layer on its own (no phaser layer) is the only combination that matches the UV/IR blocker filter response so closely.
Youve got me thinking about this now Eric, the different results we get is very interesting, a real puzzle, something is still not right
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