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| 1 | 2 | 3 |  » Stats |
Members: 48,650
Threads: 78,882
Posts: 821,319
Top Poster: glsammy (14,777)
| | Welcome to our newest member, megzie1991 | |  | | 
19-10-2009, 02:20 PM
|  | Commander of the Wild Empire | | Join Date: Jun 2009 Location: SW London
Posts: 2,049
| | | Re: Big or little Dipper
It is actually wildherbalian85's photo - I was just trying to be helpful in isolating part of the image and putting cats among pigeons - sorry. Am still wondering about this - i looked thru charts to see if I could see any clues. I hope the random pixels havent produced something along the lines of Jesus appearing on a pizza  So what did you see when you took the photo
wildherbalian85?
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19-10-2009, 02:49 PM
|  | Wild Member | | Join Date: Dec 2006 Location: Darlington - UK
Posts: 162
| | | Re: Big or little Dipper
Quote:
Originally Posted by loripo  It is actually wildherbalian85's photo - I was just trying to be helpful in isolating part of the image and putting cats among pigeons - sorry. Am still wondering about this - i looked thru charts to see if I could see any clues. I hope the random pixels havent produced something along the lines of Jesus appearing on a pizza So what did you see when you took the photo
wildherbalian85? | Whoops! - sorry loripo 
That'll teach me to check back more carefully in future - LOL
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19-10-2009, 03:12 PM
|  | Moderator | | Join Date: Apr 2007 Location: Belvedere, Kent
Posts: 9,561
| | | Re: Big or little Dipper
Quote:
Originally Posted by carlos_dfc Yep Dave - but those GREEN stars aren't on loripo's original. | Yep, I'm with it Carlos, honest!  I was trying to make your green overlay stand out a bit more as wildherbalian and Loripo couldn't see Ursa minor in it - apologies if I just confused things! 
Dave P.
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19-10-2009, 03:20 PM
| | Commander of the Wild Empire | | Join Date: Jun 2009 Location: SW London
Posts: 2,049
| | | Re: Big or little Dipper
Oh dear - can we start again. Or you can - I'm leaving this one to the experts
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Listen out for meaning, listen out for truth, listen out for life. Listen out for the birds. |
19-10-2009, 04:40 PM
|  | Commander of the Wild Empire | | Join Date: Apr 2008 Location: South Coast
Posts: 1,750
| | | Re: Big or little Dipper
Quote:
Originally Posted by carlos_dfc Yep Dave - but those GREEN stars aren't on loripo's original.
They come from a screenshot of Cartes du Ciel (Sky-mapping software), which I superimposed onto loripo's original, in order to show that the stars in his pic aren't the Little Dipper (I also prefer 'Ursa Minor', or even the 'Little Bear')
The RED stars in that pic, are from loripo's original, and as you can see, they don't match up with Ursa Minor - nor do any of the other stars in that field.
I would be very interested if WHIan can give any more details though - such as a rough estimate of how high into the sky the camera was pointed, whether any zoom was used, or if it was a wide-angle shot - any clues at all as to the direction and scale - then I may be able to match it up with a sky chart, and possibly track down what stars they are in the original photo. |
I took a series of random shots at various zooms, the camera was just left on its back at a very slight slant.... don't ask which of the photos where taken at which angle.
Now the photo was taken using the built in Night landscape photography thing. Basically the darker it is the longer it take to take a photo... this is however pretty impressive because it takes in far more light then the eye can see.
The camera is a only a 10x zoom and is a 10 mega pixel... Kodak  |
19-10-2009, 04:49 PM
| | Commander of the Wild Empire | | Join Date: Jul 2008 Location: Watford, Hertfordshire.
Posts: 4,562
| | | Re: Big or little Dipper
Quote:
Originally Posted by pressld2 it's just the big dipper that grates. | I feel the same!
Jim |
20-10-2009, 10:59 AM
|  | Commander of the Wild Empire | | Join Date: Oct 2008 Location: north Surrey/SW London
Posts: 1,115
| | | Re: Big or little Dipper
Hope you can't spot the constellations in this pic? It's a 30sec pic of nothing eg with the cap on the camera and records the defects eg hot pixels. These actifacts are superimposed on all my pics of 30 sec exposure via my astrocam but subtracted automatically so they don't appear in the finished pic.
I not suggesting all the stars on Wildherbalian85 pic are artifacts but maybe some of them which are distorting the constellations recorded. It would still be helpful in future if notes are taken to accompany star pics that need identifying such as date/ time/ sky direction/ camera setting etc. Just a thought  
Last edited by nytecam; 20-10-2009 at 11:05 AM.
|
20-10-2009, 09:25 PM
|  | Wild Member | | Join Date: Oct 2005 Location: Cumbria
Posts: 244
| | | Re: Big or little Dipper
Good point & very interesting. I didn't know about that.
How long must the exposure be before the rotation of the earth causes the stars to begin leaving a trail (assuming equipment to prevent this was not being used). All the stars in the original photo seem to be still points of light with no tails?
Last edited by Rich_; 20-10-2009 at 09:38 PM.
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20-10-2009, 11:45 PM
| | Moderator | | Join Date: Apr 2007 Location: Belvedere, Kent
Posts: 9,561
| | | Re: Big or little Dipper
Quote:
Originally Posted by Rich_ How long must the exposure be before the rotation of the earth causes the stars to begin leaving a trail (assuming equipment to prevent this was not being used). All the stars in the original photo seem to be still points of light with no tails? | I played around with some software for stacking images to make star trail photos a year ago. You take a series of 30 second exposures then merge them into one. Even the individual 30 second exposures showed slight smearing of the stars.
You can see some examples of the finished images in this thread: Photographing star trails
Dave P.
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21-10-2009, 05:56 PM
| | Wild Member | | Join Date: Oct 2005 Location: Cumbria
Posts: 244
| | | Re: Big or little Dipper
They are good pictures Dave, I'm assuming the circular one is aimed near the Pole Star showing the Earths rotation very well?
I was just wondering if the original posters camera shutter had actually been open bearing in mind it was an automatic setting? | | | |
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