The Dwarf mini has a dual-band filter that effectively separates the O3 into the green and blue channels and the H-alpha into the red channel of the colour image it produces. (There is a LP filter in Seestars that effectively does the same thing).
This can be used effectively to produce HOO narrowband images as shown in the following animations:
The North America nebula
The Rosette nebula
The Monkeyhead nebula
The Eagle nebula
The Tulip nebula
IC1318A
I have written an article on how this can be done using Gimp. Full details and all of the images can be found HERE.
Steve Wainwright
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