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The Seagull Nebula

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SV80ST @ f/4.5 
Riccardi 0.75x Reducer 
Moravian G3-16200
Optolong LRGB
Astrodon Ha/OIII/SII Mach1GTO CP4

RGB=4x10min each
Total = 10hrs

Despite the appearance of a straight RGB color image, this image consists primarily of narrowband data (Ha/OIII).  There is only 2hrs of RGB data, far less than typical RGB images. 

This is a hubble palette image using the same Ha and OIII as above, with the addition of SII.