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Sword of Orion
Lens: Orion 8" Astrograph Camera: Pentax K5 IIs Photo Location: City of Edmonton ISO: 400 Shutter Speed: Above 6s Aperture: F4 
Posted By: Dr_who, 12-22-2012, 12:34 PM

Main Targets Objects: M42 - Orion Nebula, NGC 1977, NGC 1975, and NGC 1973
Approx Distance: 1,500 light-years
Camera: Pentax K-5 IIs
Lens/scope: 8" F3.9 Orion Newtonian.
Mount: Skywatcher HEQ5 Pro
Stacking Software: DeepSkyStacker 3.3.2

Here's the rough exposure data

8 x 195s Exposures
7 x 120s Exposures
21 x 60s Exposures
10 x 30s Exposures



Last edited by Dr_who; 12-23-2012 at 12:42 PM.
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12-22-2012, 12:41 PM   #2
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Very Very Impressive.--charliezap
12-22-2012, 01:00 PM   #3
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Wow! Just Wow!

Gorgeous!
12-22-2012, 09:38 PM   #4
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Amazing, great photo !!

12-22-2012, 11:34 PM   #5
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Damn, that is amazing to say the least. TFS.
12-23-2012, 12:24 AM   #6
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Original Poster
The interesting thing is this was done within the city, i wanted to test the new camera for astrophotography and didn't want to wait till I could go outside of the city. Should be a treat when I get that chance.
12-23-2012, 03:02 AM   #7
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Amazing....I don't know much about astro-photography but how did you managed to prevent star trails with such a long exposure? I find the limit before star trails appears is 20 sec or less.
12-23-2012, 06:07 AM   #8
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Well, that is a stunner, and thanks for the detailed technical info. The K-5 IIs is clearly a great match for astrophotography, in the right hands! Certainly a brand-appropriate scope for this shot.

catastrophe: look up the mount; it's a computerized telescope mount that automatically tracks the rotation of the "celestial sphere". Back in the old days one would have to do this manually, looking through a guide scope at a guide star and carefully keeping it centered all through the long exposure.

12-23-2012, 06:49 AM   #9
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What they all said wow and outstanding.
12-23-2012, 07:05 AM   #10
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Pretty amazing
12-23-2012, 12:50 PM   #11
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Original Poster
QuoteOriginally posted by catastrophe Quote
Amazing....I don't know much about astro-photography but how did you managed to prevent star trails with such a long exposure? I find the limit before star trails appears is 20 sec or less.
Catastrophe - baro-nite is right, the mount is a motorized mount that is aligned with polar north. Even so to get perfect alignment to 4 minutes you have to be really dead on the alignment. So a added gadget used is a Orion Autoguider which is connected to a low end 5" notebook. Doesn't need to be highend computer or anything, but it just watches a selected star and tells the mount to make very minor changes over time to keep it on its course. You still need to be polar aligned however and can't just follow a star as it can't compensate for field rotation. Blablabla going off on a rant.

Baro-nite - It certainly is a perfect brand-appropriate scope!

I really do look forward to going out of the city and giving it a go, but its been overcast and snowy for awhile now
12-24-2012, 04:22 AM   #12
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Fabulous!
12-31-2012, 03:16 PM   #13
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great focus, very good!!
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