Niels V. Christensen
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LX200ACF 16" and SBIG ST-8XME. To get focal lenght down a Lepus 0.62x reducer was used.
The Bubble Nebula is shown in so called 'natural colors' using narrow band filters. RAW data used for making the picture, LUM=26*1min.+5*2min. Ha=18*5min.+4*2min. OIII=18*5min. SII=5*5min. Small mix of old color data added to the shown L,80Ha20SII,100OIII,85oIII15Ha picture. CCDStack2 and Adobe Photoshop programs used and all the subs were calibrated before stack with dark, flat, Darkflat and bias frames.