I had a go on Saturday at a false colour 2 x Narrowband and 1xBlue filter for a colour composite of M51, look at the Red stars there heavy on Ha emmissions and the greenish areas are big on OIII emissions. Not perfect (I will try harder) but I was using a new F3.3 focal reducer and its a git to focus with.
Right then, new toys etc so here we go: -
R = 20 x 30 seconds Ha filter;
G = 40 x 30 seconds OIII filter;
B = 40 x 5 seconds blue 80A filter;
Meade LX90 & F3.3 unguided, with SAC8.
All processed with AIP, Registar and Photoshop, smoothing done in PixInsight.
(http://www.jumpers4goalposts.org.uk/images/Astronomy/Messier/M51_False_RGB_20050313.jpg)
Blue
(http://www.jumpers4goalposts.org.uk/images/Astronomy/Messier/m51-b-20050314.jpg)
Red
(http://www.jumpers4goalposts.org.uk/images/Astronomy/Messier/m51-r-20050314.jpg)
Green
(http://www.jumpers4goalposts.org.uk/images/Astronomy/Messier/m51-g-20050314.jpg)
[ This Message was edited by: csuddell on 2005-03-17 12:22 ]
Nice HII regions.