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Christmas Tree to the Rosette


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Taken with the Samyang 135mm at f2.8 combined with the ZWO ASI1600MM-Pro Cooled at gain 139, offset 56 all set on an iOptron CEM25-EC mount - all unguided in a Bortle 5 region.

ngc2254-hos.thumb.jpg.63994455bc4c511e49bf4ef6fe40d41e.jpg

The image comprises 25 x 120s of Ha, OIII and SII pre-processed in PI followed by StarAlignment, DynamicCrop and ABE applied twice in subtraction and division mode. Repeated incremental HistogramStretch used to take each master non-linear and then all combined in PixelMath R:G:B = Ha : 0.4Ha+0.6OIII : OIII and R:G:B Ha : OIII : SII followed by SCNR to remove the excess green.

These two images were then layered in Photoshop with a layer mask to bring out the best areas of both images. All followed by an application of Star Reduction action from Annie's Astro Images and a minimal amount of Noise Reduction.

Thanks for looking.

Adrian

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