“NGC 300 The Grand Nebulae Preserve” 

NGC 300, also known as Caldwell 70 or the Sculptor Pinwheel Galaxy, is a spiral galaxy located in the constellation Sculptor, approximately six million light-years from Earth. It is one of the nearest galaxies to the Local Group, lying between it and the Sculptor Group, and is the brightest of five major spiral galaxies in that direction. Its diameter is 94,000 light-years, making it slightly smaller than the Milky Way.

 Here is the SHORGB version: 

 NGC 300 is a galaxy with thousands of hidden nebulae. When deep images of this active face-on spiral galaxy using HA (Hydrogen), S2 (Sulfur II), and O3 (Oxygen III) narrowband filters—and after removing the stars from the Red, Green, Blue broadband light—this remarkable view is revealed. 

Here is the RGB Star Layer:

 Here it is with the RGB stars removed:

 Here is the LRGBHa version. Luminance data from previous version: 

Imaged in LRGBHa on a Planewave CDK 24 at Observatorio El Sauce, Chile. Taken with 2 different cameras SBIG 16803 and Moravian C5.

Ha 22.5h, S2 12.5h, O3 12.5h, RGB 7h each

Total 68 hours.

Enjoy,

SWOS Group, Mazlin, Parker, Forman, Magill, Hanson

Thanks to Alex Zaytsev for helping with the description and the wonderful annotated version.

Older versions below: