M7 (Geof Lewis) - AstroBin

Celestial hemisphere: Southern · Constellation: Scorpius (Sco) · Contains: M 7 · NGC 6444 · NGC 6453 · NGC 6455 · NGC 6475 · Ptolemy's Cluster

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M7

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M7

Whilst visiting my daughter near the south Hant's UK coast, I took the opportunity to try and capture the lowest altitude Messier target, M7, which I'm unable to see from my home location some 2 deg further north. Even so M7 transits at 4.5 degs, but that was before darkness, so the data was captured when the target was closer to 3 deg altitude, looking out over the English Channel west of the Ilse of White.
After stacking and processing the data, the image was overly red and all the stars had horrid red halos, most likely attributable to the lack of IR suppression in my modified Canon 600D, possibly exacerbated by atmosheric extinction at such a low altitude and porr colour correction of the old Nikkor lens. Vers B shows the red haloed stars. As I merely wanted an image of this target for my Messier collection, I've opted to extract the luminence from the colour image and show as a mono image which I think is more pleasing. The only way I'm going to get a better colour version of M7 is with an unmodified camera, better lens, or scope and probably from a country at a more southerly location, the latter being unlikely to happen.
NB Both images are significant crops from the original image, to better show just M7.

Final
Original
B

B

Title: Horrid red halos

Description: This is the processed colour stack showing horrid red halos, probably due to a combination of astmospheric extinsion at such a low altitude, IR from the modified camera with no IR blocking filter and poor colour correction from the old Nikkor lens.....!!

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Status	Advanced failed
Started	...
Astrometry.net job	6069436
PixInsight job	TRSTC9IHWX6MMF4HXWK8ALDL0FRJ8ZY2
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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