Hi
I had previously taken some Ha and OIII data on this and managed to get out and get 3 hours of SII data in 30 minute sub frames. Normally I process my narrow band images using the HST palette partly because I prefer it but also because it is more scientifically correct in that the filters are asigned in order of wavelength, but I found that using this palette the OIII envelope that surrounds the main nebula didn't show up very well so I changed to a palette commonly used by the Canada France Hawaii Telescope (CFHT) where the filters are asigned to RGB in the order of Ha:OIII:SII.
This was taken with my current set up of Takahashi FSQ106ED at f5, Paramount ME and Starlight Xpress SXVF H9 with exposures of 7x30 minutes for Ha, 8x30 minutes for OIII and 6x30 minutes for SII, I would have got more SII but clouds interrupted the session. The master frames were colour combined in Maxim DL with a weighting of 1:2:7 for Ha:OIII:SII and processed in Photoshop CS2 using levels and a series of 'S' shaped contrast curves, in order to better distinguish between the main nebula and OIII envelope I used selected colour to shift the colour balance.
All three versions (Ha, Ha/OIII and CFHT palette) can be seen on the Nebulae 2 page of the image gallery of my website
http://www.imagingtheheavens.co.uk
and there is a full size image at the following link
http://www.pbase.com/image/136460025/original
Thanks for looking
Best wishes and clear skies
Gordon
