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M42 Orion Nebula central region photographed in 3 emission lines: Ha at 656nm (900 seconds), SII at 672nm (1560 seconds) and OIII at 501nm (2220 seconds). Night of 28 January 2019, London UK.

 

Scope: SW 150mm/F5 achromat refractor at prime focus

Camera: 1004x monochrome PAL board camera, long exposure modified

 

Imges aligned, stacked and stretched in registax, further processed in Photoshop Elements

Done