DSLR - Yes, modded.
I have clip in 12nm Ha and OIII filters which give results I'm happy with.
Examples...
Horsehead in Ha
http://s327.photobucket.com/albums/k...urrent=12c.jpg
Tarantula in OIII
http://s327.photobucket.com/albums/k...current=26.jpg
Also done synthetic RGBs too,
http://s327.photobucket.com/albums/k...current=27.jpg
Taken with Astronomik EOS clip in filters in the modded 40D
Doug