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#11
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Digitally altered images.....
On 10/31/2016 5:30 AM, David Taylor wrote:
What about the image he http://www.esa.int/spaceinimages/Ima...a_over_Iceland the full resolution version: http://www.esa.int/var/esa/storage/i...er_Iceland.jpg Digitally altered or genuine? Is the subject digitally altered, except for cropping? https://dl.dropboxusercontent.com/u/97242118/_DSC3189.jpg -- PeterN |
#12
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Digitally altered images.....
On 10/31/2016 8:47 PM, Ron C wrote:
On 10/31/2016 4:48 PM, Floyd L. Davidson wrote: Ron C wrote: On 10/31/2016 2:35 PM, David Taylor wrote: On 31/10/2016 16:13, Floyd L. Davidson wrote: [] Why would you suspect it is "altered"? Looks perfectly normal... Maybe you are not familiar with Auroral displays? Yes, I am familiar with auroral displays, but this one looked rather unusual. The sequence of shots is awesome. There is no sequence, just one single exposure. The web site lists 3 seconds, at ISO 1600, using a 14mm f2.8 lens using a Canon 5Dmii camera. That looks to be exactly the case too. The moon and the landscape are all perfectly sharp. There are stars showing in the sky, and they are just barely "out of round", as one might expect with a 14mm lens and a 3 second exposure. He doesn't say what the aperture is, but my guess is at or nearly at wide open. It appears that his camera configuration is very close to optimal! Any faster on the shutter speed and a fast moving Auroral display will actually blur. There is a limit to the useful ISO with a 5Dmii camera, so it is very hard to fault the exposure. It's a very nice shot! http://imglf1.ph.126.net/8p5mCBTbJyc...3235368452.jpg For what it's worth: Sorry for being so terse. I was in the middle of some intense trick-or-treat door answering (I do a whole big production) plus had an injured cat to tend too. [Not that anyone here might care.] Anyway, glad to have found and provided that pointer to more on that photo. == Later... Ron C -- |
#13
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Digitally altered images.....
Ron C wrote:
On 10/31/2016 8:47 PM, Ron C wrote: On 10/31/2016 4:48 PM, Floyd L. Davidson wrote: Ron C wrote: On 10/31/2016 2:35 PM, David Taylor wrote: On 31/10/2016 16:13, Floyd L. Davidson wrote: [] Why would you suspect it is "altered"? Looks perfectly normal... Maybe you are not familiar with Auroral displays? Yes, I am familiar with auroral displays, but this one looked rather unusual. The sequence of shots is awesome. There is no sequence, just one single exposure. The web site lists 3 seconds, at ISO 1600, using a 14mm f2.8 lens using a Canon 5Dmii camera. That looks to be exactly the case too. The moon and the landscape are all perfectly sharp. There are stars showing in the sky, and they are just barely "out of round", as one might expect with a 14mm lens and a 3 second exposure. He doesn't say what the aperture is, but my guess is at or nearly at wide open. It appears that his camera configuration is very close to optimal! Any faster on the shutter speed and a fast moving Auroral display will actually blur. There is a limit to the useful ISO with a 5Dmii camera, so it is very hard to fault the exposure. It's a very nice shot! http://imglf1.ph.126.net/8p5mCBTbJyc...3235368452.jpg For what it's worth: Sorry for being so terse. I was in the middle of some intense trick-or-treat door answering (I do a whole big production) plus had an injured cat to tend too. [Not that anyone here might care.] Anyway, glad to have found and provided that pointer to more on that photo. == Later... Ron C Yes! Thank you very much. The sequence is far more interesting that just the one image, nice as it was. -- Floyd L. Davidson http://www.apaflo.com/ Utqiagvik (Barrow, Alaska) |
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