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Astronomy and Cosmology
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Our Beautiful Universe - Photos and Videos
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[QUOTE="collinsmark, post: 6856796, member: 114325"] The Great Orion Nebula (also called M42), taken from my back patio in January 2023, with a sort-of old astro-camera, and some really old narrowband filters that were lying around. [ATTACH type="full"]322515[/ATTACH] Those purple orbs are "halo" artifacts from the old narrowband filters, which occur around bright stars. The halos themselves are not actually in space nor did I put them in the image intentionally for artistic purposes. Narrowband filters don't generally degrade over time either (aside from general wear and tear). It's just that narrowband filters are designed and manufactured better these days, to reduce or even eliminate such halos. The filters used here were from a time before such improvements were made, and are pretty unforgiving. My idea was to put together a secondary telescope setup, frankensteining old components together with enough new stuff to get it to work. I'm still in the process of tweaking it. This is probably the last image with those old narrowband filters though. Equipment: Explore Scientific 80ED-FCD100 Sky-Watcher EQ6-R Pro Orion Field Flattener for Short Refractors Guide scope and guide camera Astronomik narrowband filter set, circa 2008 ZWO ASI1600MM-Pro main camera Software: N.I.N.A. PixInsight with RC-Astro plugins GIMP Integration: Bortle class 7 (maybe 8 ) skies. All subframes binned 1x1 SHO mapping SII: 622×40s = 6.91 hrs Hα: 111×60s + 464×40s = 7.01 hrs Oiii: 548×40s = 6.09 hrs Total integration time: 20.0 hours. Oh, I should mention that M42 is pretty bright. In dark skies, you can see it with the naked eye. [/QUOTE]
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