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Sharpless 2-91

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SV80ST
QHY163M 
Astrodon Ha/OIII/RGB Mach1GTO CP4

Ha=71x5min
OIII-60x5min
R=23x3min
G=24x3min
B=21x3min
Total = 14hrs 19min

This image consists of data from 5 filters.  The Ha and OIII filters provide the bulk of the nebula while the RGB contributed to the stars.  This is a rare object where the OIII is actually stronger than the Ha.