I'm not a fan of narrowband imaging but details that are readily visible in narrowband images are generally not so obvious in LRGB, even if narrowband filters are used for luminance.
I'm fairly pleased to have preserved the OIII spokes in this L=Ha+OIII RGB image.
The spokes are lost in the combined luminance if the images are normally processed.
Details
L=10 hrs OIII+ 6hrs Ha, 1 hr each RGB.
BRC-250 scope, STXL-11002.
High resolution.
http://members.iinet.net.au/~sjastro/ngc7293sp.jpg
Comments welcome.
Steven