Here is another narrow band image that I took with the new Microline x814 camera, it uses a Sony interline chip with 3.69 micron pixels and has over 9 mega pixels in the sensor. This was attached to my Televue NP127/FLI astrograph in place of the Proline 16803 as I wanted to try some narrower FOV higher resolution shots. Exposure times are as follows
Ha 23x10 minutes, OIII 18x10 minutes and SII 22x10 minutes. There is very little SII in this subject.
All the raw frames were calibrated with darks, flats and bias frames. Processing was mainly stretching the weaker channels, colour combine to HST palette, levels with some minor curves adjustments, colour balancing, contrast adjustments, a little high pass filtering and shadows and highlights.
The large size image can be seen at the following linkhttp://m8.i.pbase.com/o9/29/869929/1/160651878.GFEsNwru.NGC6888HSTmax2000.jpg