Thanks @fooblic
Yes, sure i could do that....very good idea.
I will create a tutorial or how-to in the next days. Perhaps i find some time tomorrow.
Most of my shots are taken with the same cam, an old modified Pentax K100d super which has a quite weak IR blocking filter already when delivered. But i removed it completely, this has also the drawback that it sucks at normal photography now :D I will explain that a bit more in a detailed post.