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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4356
Loc: Leeds, UK, 54N
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Imagine in a few million years (actuallly many many million years) our prespective onto our galaxy will change. Constellations will shift and new ones will be formed. But what will happen to our favourite deep sky objects??
Here's my take - this is the "over mascara'ed Evil Eye" nebula
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4356
Loc: Leeds, UK, 54N
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And while you are thinking up your own, here's the components in their current arrangement.
Mosaic of 24 + 31 x 6 minutes at ISOS 800 unguided on a Losmandy GM-8 of IC5146 - the Cocoon Nebula and its dusty environs. Total 5.5 hours under 20.80 bmpsas skies (= NELM 6.00)
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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Grouptele
sage
Reged: 08/11/07
Posts: 304
Loc: Qcy, IL
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Quote:
Mosaic of 24 + 31 x 6 minutes at ISOS 800 unguided on a Losmandy GM-8
Very nice wide-field image! How did you manage 6-min captures with the unguided GM-8?
Victor
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C8-XLT, G5, AT66
EQ-G
Starshoot color CCD
Canon XS, HapMod
SPC900NC webcam
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s58y
Postmaster
Reged: 12/12/04
Posts: 5509
Loc: Eastern NY
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Nice mosaic -- it looks like the ultra-dark conditions plus long exposure allowed you to capture the dusty areas and dark nebulae.
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Hutech 30D, SBIG ST-402 autoguider
SV80S, TV102iis
Old camera lenses: 800mm f/5.6, 180mm f/3.4
AP900, Barndoor tracker
http://www.pbase.com/s58y
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Nils_Lars
Post Laureate
Reged: 01/04/08
Posts: 3443
Loc: Santa Cruz Mountains , CA
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I like the future perspective , cool shot.
Lots of clean data from dark skies makes for a very good shot.
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Erik
Orion Atlas Self Hypertuned (EQMOD)
Orion ED 80
Williams Optics VII reducer
Celestron 8" SCT
Orion Starshoot Autoguider
PHD guide
Canon 400D Hap Griffin Mod w/Baader filter
Astronomik clip-in LP filter and 12nm Ha
Stilleto CVF and Bahtinov mask
Tamron 75-300mm&28-80mm lenses
NexImage webcam
http://www.flickr.com/photos/31986095@N05/
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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4356
Loc: Leeds, UK, 54N
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Quote:
How did you manage 6-min captures with the unguided GM-8?
By very precise polar alignment with the Gemini Controller's PAC procedure - the alignment error from the pole was < 30 arc seconds - Gemini measures that for you.
Also I'm using a widefield scope - FL 480mm
However even then I was just over the limit - see making oval stars round
Lastly Losmandy mounts are top notch
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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Tonk
Post Laureate
Reged: 08/19/04
Posts: 4356
Loc: Leeds, UK, 54N
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Quote:
ultra-dark conditions
Actually 20.80 bmpsas isn't that dark - the clouds are still lighter than the sky - it is classed as rural/suburban transistion zone. I class 21.5 bmpsas as the start of proper dark skies (NELM ~ 6.4). But all the same its way better than the 19.6 (NELM ~ 5.2) from my back yard
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Televue 85, GM-8/Gemini, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB)
Coronado SM60/BF10, Baader Herschel Wedge
Leeds Sky Clock Ripon Sky Clock
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s58y
Postmaster
Reged: 12/12/04
Posts: 5509
Loc: Eastern NY
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Quote:
Actually 20.80 bmpsas isn't that dark
Whoops -- in my haste, I was thinking 21.80 instead of 20.80 when I made the reply.
Where I shoot from, I can measure 21.50 only when the Milky Way is far from the zenith, and 21.80 is unheard of, unless you go hundreds of miles away.
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Hutech 30D, SBIG ST-402 autoguider
SV80S, TV102iis
Old camera lenses: 800mm f/5.6, 180mm f/3.4
AP900, Barndoor tracker
http://www.pbase.com/s58y
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