14  January  2017
 
    M20 in... narrowband? what about the reflection nebula?  

                                                                                                                    
    


 By    Josep Drudis
www.astrodrudis.com )

This is an image taken in bicolor narrowband (Ha + OIII), but OIII was blended with broadband Blue, in order to recover the reflection nebula.
Telescope: 20inch, f/6.8. Camera: SBIG STX 16803. Total exposure: 12 hours 45 min, including 90 min RGB for the stars.

     

 

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