some more results
another amateur in Portugal also managed to convert his 350D to mono by removing the CFA layer using my method.
he's had better weather than us, so here is a comparison of a mono 350D Ha image with a QHY9 Mono image taken by marc from IIS.(with permission)
the 350D is uncooled, 12bits, 12nm ha filter, 5x5min Sub, 8inch F4
QHY9 mono is 16bit, cooled, 7nm Ha filter, 15x5min subs, 90mm APO
Obviously the qhy9 image is a lot smoother but I was surprised to see that there is no significant loss of detail in the dslr image and it compares very well with the qhy9 given that the cost of the 350D was $150, and the qhy9 is $2300 or so.
This makes narrowband very affordable in my opinion.
I had to scale up the 350D image as the imaging scales are quite different with the F4 and the F7.
https://www.dropbox.com/s/rvij6c77e9...vsmono350d.jpg
Cheers
Alistair