Finally had a clear night until the fog started to form but I managed to get some narrow band data.
Camera Canon 5DH. Modded 100ED.
Filters Astronomik CCD 13NM HA and OIII, Hutech Hbeta which is not narrowband but passes all blue from Hbeta up to UV.
HA 4x16min, OIII 4x16 min, Hbeta 3x16 min. All at an ISO of 500.
After correcting for flats and stacking I obtained three tiff images which I made identical in size and region etc with Registar. These were then split into RGB components and then recombined with Images plus.
Red data from HA to Red
Green and Blue data from OIII to Green
Blue data from Hbeta to Blue
I did not get good blue data due to fog and a Mercury street lamp. But I can control this some what by using a Hutech LPR or NF in conjuction with the Hbeta filter to restrict the extent of the blue. The fog put a stop to this.
I think this method should give a more 'natural' looking narrowband image. This is a first attempt and any comments are welcome.
Large image 1.7 MB
http://members.optusnet.com.au/~trlee8/LTNB.jpg
Bert