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yobbo89 wrote: ↑Fri Nov 29, 2019 3:44 pm
pretty good image as expected (it's actually superb!)from an advance imager like you.it can be such a horrible task to image this target. the halos are fine, the image is almost perfect, i only see a small defect that captures my eye which is the streak of blue,a strange diffraction from the bright star Alnitak, you'll have to post some of your processing procedures. when ever i image with that star in the field of view it is a nightmare , the halo and diffraction stretchers over the horsehead nebula. it looks like most users have better success with a refractor over a newt with this target.
Yep, those blue streaks are from the OIII data......I thought when I got the Astrodon 3nm filters that'd go away....alas, they're still there!! I used the old SHO-AIP Script to blend this. RGB at 100%, R=50% H-Alpha+50% SII+100% R, G=15% H-Alpha+15% SII+ 70% OIII +100% G, B=100% OIII +!00% B. For Luminance I HDR combined all my masters of 60s, 180s, 300s, and 420s....then in SHO-AIP I used the MixingLuminance tool to combine the H-Alpha at 100% with the HDR L at 70% and used that as my Luminance in the Mixing L-SHONRVB process. I came up with a fairly good SHO-AIP image but the streaks were obvious, so I increased the contrast enough to make them not as visible (still are but you gotta look real close). Anyway, thanks for liking the image.....if the skies ever clear, I'm gonna take some shorter OIII subs and see if I can somehow eliminate those streaks!
Thanks Again !!
Tom
Sorry to post again, but I keep coming back to this excellent image every time I come to TSS. Tom, you really did hit a grand slam when you posted this image. I doff my NHRA 2016 Mello-Yellow Series hat in your general direction, sir!
Telescopes: Meade LX90 10-inch f/10 UHC Coma-free SCT; Explore Scientific 127mm f/7.5 APO ED triplet refractor; Explore Scientific 102mm f/7 APO ED triplet refractor; Explore Scientific 80mm f/6 APO ED triplet refractor; Skywatcher 72mm f/6 ED Schott doublet refractor; Meade 70mm f/5 APO quadruplet astrograph refractor; Skywatcher Quattro 8-inch f/4 Newtonian astrograph; Orion 6-inch f/4 Newtonian astrograph; Skywatcher SkyMax 180mm f/15 Maksutov; iOptron 150mm f/12 Maksutov; Orion f/9 Ritchey-Chretien RC astrograph Eyepieces: Set of 7 Baader Hyperion eyepieces, 3 Meade 5000 glass handgrenades; 1970s era Japanese manufactured Meade 12.5mm Orthoscopic, and too many other eclectic eyepieces to list Mounts: Skywatcher EQ6-R Pro mount; Orion Atlas EQ-G mount Post-production Software: Not good enough … oh, okay ... Canon's proprietary CanoScan ArcSoft 9000F photoshop suite
Gordon
Scopes: Explore Scientific ED80CF, Skywatcher 200 Quattro Imaging Newt, SeeStar S50 for EAA.
Mounts: Orion Atlas EQ-g mount & Skywatcher EQ5 Pro.
ZWO mini guider.
Image cameras: ZWO ASI1600 MM Cool, ZWO ASI533mc-Pro, ZWO ASI174mm-C (for use with my Quark chromosphere), ZWO ASI120MC
Filters: LRGB, Ha 7nm, O-III 7nm, S-II 7nm
Eyepieces: a few.
Primary software: Cartes du Ciel, N.I.N.A, StarTools V1.4.