Samyang - 'three in one' - first light (Tom Gray)

Samyang - 'three in one' - first light

It is said "if you can't beat 'em, join 'em" - and I couldn't resist the most used camera lens for Astroimaging - the mighty Samyang 135mm f2. An eleven element lens, with ED glass; this outperforms my old Pentax SLR 70-210mm lens in every respect - 62mm aperture, fast f2 optics, anti-reflective coatings, no violet aberrations and copious mounting options... perfect for my wide-field setup.

Herewith first light, on a very blustery and bright 'Boxing Day' morning, just 5 minute integration at f4. Manual focusing by sight only - I struggled to get a tight focus at f2.8, and there were nasty halos at f2. I haven't optimized the backspacing - using a T2 adapter plate, with my Altair filter drawer and Hypercam 183C. This combination is severely under-sampled, and I used 2x drizzle in Siril to achieve a reasonable resolution of 4 "/pixel. Anyway, I'm perfectly happy with this first effort, and the aberration inspector does not show any major flaws. Once I figure out the correct spacing, I should be able to image at f2.8, even wide open at f2 with determination. I'm very impressed with the amount of signal through a Baader UHC-L booster filter (which I forgot to remove).

Samyang, according to 'Google', 'SAM' means - "three in one - heaven, earth and mankind", a fitting message for this Christmas time, and 'yang' means 'nutrition', pointing to the grocery roots of this technological empire. Anyway I'm pleased to be a member of this particular club, and look forward to extending my reach into the universe. Wishing you all a healthy and hopeful New Year, where we focus a bit more on this trinity.

Final
Original
B

B

Title: Mono processing 1x1

Uploaded: ...

Sky-Watcher Star Adventurer
Altair Astro 183 M/C Hypercams
UK Astro-Imaging
Camera Lens Astrophotography

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Deep sky
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Star trails
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Own remote observatory
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Professional, scientific grade data
Mix of multiple sources
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Status	Advanced success
Started	...
Astrometry.net job	8963092
PixInsight job	TG3X7FDUP051I6T6XR6YQ8LLF4AHOLZJ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h34m04s.95
RA (top/left)	05h42m31s.47
RA (top/right)	05h42m07s.30
RA (bottom/right)	05h25m41s.54
RA (bottom/left)	05h26m00s.31

Dec (center)	-03°16′32″.2
Dec (top/left)	-06°18′33″.3
Dec (top/right)	-00°10′39″.9
Dec (bottom/right)	-00°14′22″.4
Dec (bottom/left)	-06°22′05″.0

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