I've been playing around with NB filters with DSLR's and having lots of fun.
This is 217 mins of Ha, and 90 mins of OIII with a Canon 60Da.
Ha mapped to the red channel, OIII to blue and green.
No darks or flats used.
Processed in AstroArt, but me skills have let me down again, tho I'm pretty happy for only 70mm of achromat
I'm still having issues with the flattener, I added a 3mm spacer but this seems to have made zero improvement.... need to sort this, it's getting frustrating.
Image cropped to rid the worst of the coma.
Very small version attached here (damn 200k limit) but a large version(2000x1386) with warts and all is at Astrobin:
http://www.astrobin.com/full/98888/0/?real=&mod=