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  #1  
Old 17-07-2017, 06:04 PM
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cometcatcher (Kevin)
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M27 The Dumbbell Nebula in 90 seconds

M27 The Dumbbell Nebula, single 90 sec sub, taken between clouds. GSO 10" F4 Newtonian, Full spectrum Canon 1100D, Baader UV/IR cut filter, HEQ5 Pro unguided. Processed in Photoshop. Bigger but not really better at Astrobin ---> http://astrob.in/303653/0/

"The Dumbbell Nebula (also known as Apple Core Nebula, Messier 27, M 27, or NGC 6853) is a planetary nebula in the constellation Vulpecula, at a distance of about 1,360 light-years.

This object was the first planetary nebula to be discovered; by Charles Messier in 1764. At its brightness of visual magnitude 7.5 and its diameter of about 8 arcminutes, it is easily visible in binoculars, and a popular observing target in amateur telescopes.

The Dumbbell Nebula appears to be shaped like an prolate spheroid and is viewed from our perspective along the plane of its equator. In 1992, Moreno-Corral et al. computed that its rate of expansion in the plane of the sky was no more than 2.3" per century. From this, an upper limit to the age of 14,600 yr may be determined. In 1970, Bohuski, Smith, and Weedman found an expansion velocity of 31 km/s. Given its semi-minor axis radius of 1.01 ly, this implies that the kinematic age of the nebula is some 9,800 years."
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  #2  
Old 17-07-2017, 06:48 PM
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Atmos (Colin)
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For nothing more than 90s, that's fabulous! I would have guessed several times more exposure than that.
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Old 17-07-2017, 06:54 PM
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Great job; the benefit of 10" f/4.
raymo
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Old 17-07-2017, 07:02 PM
Tony_ (Tony)
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Amazing for only 90s! I really need to get one of those 10" F4s. It takes me at least half an hour with my SCT to get something like this.


Tony.
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  #5  
Old 17-07-2017, 07:21 PM
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F4 = v8 !!
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Old 17-07-2017, 07:45 PM
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Great stuff Kevin, a bit low for our southerners.
Add more data and make the image really jump out!
Bo
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  #7  
Old 17-07-2017, 07:48 PM
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Even my 8" f/5 used to surprise a few people, as far as single frame
images were concerned.
raymo
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  #8  
Old 17-07-2017, 10:05 PM
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Quote:
Originally Posted by Atmos View Post
For nothing more than 90s, that's fabulous! I would have guessed several times more exposure than that.
Thanks Colin!

Quote:
Originally Posted by raymo View Post
Great job; the benefit of 10" f/4.
raymo
Thanks Ray. DSLR's really like F4 I've discovered.

Quote:
Originally Posted by Tony_ View Post
Amazing for only 90s! I really need to get one of those 10" F4s. It takes me at least half an hour with my SCT to get something like this.

Tony.
Thanks Tony. I had the same problem with my F9 refractor.

Quote:
Originally Posted by ChrisV View Post
F4 = v8 !!
That's about it lol.

Quote:
Originally Posted by traveller View Post
Great stuff Kevin, a bit low for our southerners.
Add more data and make the image really jump out!
Bo
Thanks Bo! I'd like 10 hours. I'd also like for these clouds to clear off!

Quote:
Originally Posted by raymo View Post
Even my 8" f/5 used to surprise a few people, as far as single frame
images were concerned.
raymo
Yeah it did Ray. I think a single CR2 opened in Photoshop camera RAW and adjusted in the pre-opening stage is quite a powerful tool. Not that I don't like 1000+ stack either lol, as I do. But I'm stuck with this crap weather.
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  #9  
Old 17-07-2017, 11:31 PM
Mickoid (Michael)
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Wow! I'm impressed. You even got some star colour as well and with only a single 90 second sub and DSLR, who needs fancy expensive equipment? Great job, thanks for sharing.
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  #10  
Old 17-07-2017, 11:38 PM
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Quote:
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Wow! I'm impressed. You even got some star colour as well and with only a single 90 second sub and DSLR, who needs fancy expensive equipment? Great job, thanks for sharing.
Thanks Michael! That's the point I'm trying to convey too. Fairly basic but well matched equipment can still get nice results. At least for the brighter objects in the sky.
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  #11  
Old 18-07-2017, 07:15 AM
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sil (Steve)
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love the colour, beautiful pic
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  #12  
Old 18-07-2017, 04:19 PM
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Thanks Sil. I think the colour is richer on a single unstacked CR2 than what comes out of DSS.
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  #13  
Old 18-07-2017, 05:08 PM
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Camelopardalis (Dunk)
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Noice

f/4 seems to be where it's at...must try that sometime
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  #14  
Old 18-07-2017, 07:11 PM
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Thanks Dunk. I just wish F4 was easier to collimate.
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Old 18-07-2017, 09:41 PM
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Yeah that's what scares me
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  #16  
Old 20-07-2017, 11:30 PM
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Great image.

I worked out that if I reduce my LX200 to f/6.3, I would still need a 223 second exposure, to get the same result. Sigh.
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  #17  
Old 21-07-2017, 11:52 AM
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Quote:
Originally Posted by Shano592 View Post
Great image.

I worked out that if I reduce my LX200 to f/6.3, I would still need a 223 second exposure, to get the same result. Sigh.
223 seconds is still not that long, compared to some.
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