DPChallenge: A Digital Photography Contest You are not logged in. (log in or register
 

DPChallenge Forums >> Individual Photograph Discussion >> What is this? Anyone Know
Pages:  
Showing posts 1 - 16 of 16, (reverse)
AuthorThread
07/14/2006 01:56:51 PM · #1
Took a picture at 2:15am last night. I aimed my camera toward the N/NW at approx 45 deg. Used a used a full 300 (480mm) zoom and took this 11 sec photo. Just wondering what that was in the middle. Extra light? The thumbnail looks blank but when you open it you will see what I talking about.
' . substr('//images.dpchallenge.com/images_portfolio/22970/thumb/363588.jpg', strrpos('//images.dpchallenge.com/images_portfolio/22970/thumb/363588.jpg', '/') + 1) . '
07/14/2006 02:02:32 PM · #2
That is weird.

Maybe dirt / fingerprint on the lens?
07/14/2006 02:02:42 PM · #3
You should copy the information from your post into the additional info area on the photo page ...

It looks too big to be an astronomical feature, so the most likely cause is some thin high clouds -- at 2:15 a.m. there should have been a near-full moon around somewhere, probably just off to the left of the frame.

You might want to research relevant weather reports for additional clues.
07/14/2006 02:07:16 PM · #4
My husband, the amateur astronomer, thinks it might be a reflection inside your lens from the light of the stars? If this sounds crazy, don't blame me; I'm just repeating what he said:)

Message edited by author 2006-07-14 14:07:29.
07/14/2006 02:07:24 PM · #5
I reversed the image to see it better. First one is a straight reversal, second one is with levels adjusted for more contrast and darker...

' . substr('//images.dpchallenge.com/images_portfolio/30861/thumb/363592.jpg', strrpos('//images.dpchallenge.com/images_portfolio/30861/thumb/363592.jpg', '/') + 1) . ' ' . substr('//images.dpchallenge.com/images_portfolio/30861/thumb/363594.jpg', strrpos('//images.dpchallenge.com/images_portfolio/30861/thumb/363594.jpg', '/') + 1) . '

What is it? I donno, but I'd assume it's an artifact, not an actual astronomical feature.

R.
07/14/2006 02:08:11 PM · #6
well the thing that gets me and makes me think it perhaps wasn't an astronimical feature is that it's so static. The stars are starting to trail. I can't imagine a cloud would stay so still for 11 seconds. since they are so pin point like you'd think they'd start to streak too (unless whatever it is was on the lens). the fact that it's so centered and in such a "round" shape makes it seem a bit unnatural too.

Message edited by author 2006-07-14 14:09:27.
07/14/2006 02:10:47 PM · #7
Did you have your eyepiece covered? If left open it can give a 'light leak' to the sensor, especially if you have a fairly bright porch light behind you!
07/14/2006 02:11:38 PM · #8
Definitely a UFO invasion. No doubt about it! :o)
07/14/2006 02:14:03 PM · #9
Originally posted by GeneralE:

You should copy the information from your post into the additional info area on the photo page ...

It looks too big to be an astronomical feature, so the most likely cause is some thin high clouds -- at 2:15 a.m. there should have been a near-full moon around somewhere, probably just off to the left of the frame.

You might want to research relevant weather reports for additional clues.


It could be a lens flare from the moon after it's been noise reduced.
07/14/2006 02:15:25 PM · #10
Originally posted by kawesttex:

Did you have your eyepiece covered? If left open it can give a 'light leak' to the sensor, especially if you have a fairly bright porch light behind you!

i agree. I just recently found out about the eyepiece thing. i had a cover for it on my shoulder strap and didnt even know. it seems the most plausible answer.

Message edited by author 2006-07-14 14:16:14.
07/14/2006 02:20:32 PM · #11
I did NOT cover my eyepiece, I bet that is what is showing up. Heres another picture taken right after that one but it's a 10 min exposure and zoomed in all the way. It has a brighter area in about the same spot as the other one. So I bet the light came in through the eyepiece.
' . substr('//images.dpchallenge.com/images_portfolio/22970/thumb/363635.jpg', strrpos('//images.dpchallenge.com/images_portfolio/22970/thumb/363635.jpg', '/') + 1) . '
07/14/2006 02:24:15 PM · #12
Probably an eyepiece light leak. It's NOT something captured in the scene (note that the stars are motion blurred in the same area).
07/14/2006 02:28:56 PM · #13
First, is it repeatable?

How humid is it where you were at that time? There are a number of things about it that suggest water vaper (probably in the lens); the near centered position, the porous look of it with greater density in the middle and probably most telling the near regular occurance of small nearly perfectly round circles thru the entire area. The circles are the most interesting, they are arranged in rows, each slightly offset from each other.

This may be a bit far fetched, but what could have happened is the light came in normally, reflected off of the sensor and made an impression on a small amount of water vapor in the lens. This water vapor (and the optics of the then reversed lens) magnified the array of sensors. Over the length of time the exposure was taken, this magnified impression of the sensor would have been itself recorded and reflected. This positive re-enforcement helps to explain the greater density in the center.

How likely the above is would depend on the humidity of the area you were in, how cold the camera had been previous to the shoot, the aperture and probably other factors as well. But mainly I'm just speculating on what could result in what is seen.

David
07/14/2006 02:39:09 PM · #14
Well I could have some fun with it. And make it color. LOL
' . substr('//images.dpchallenge.com/images_portfolio/22970/thumb/363642.jpg', strrpos('//images.dpchallenge.com/images_portfolio/22970/thumb/363642.jpg', '/') + 1) . '
07/14/2006 02:39:59 PM · #15
Originally posted by David.C:

First, is it repeatable?

How humid is it where you were at that time? There are a number of things about it that suggest water vaper (probably in the lens); the near centered position, the porous look of it with greater density in the middle and probably most telling the near regular occurance of small nearly perfectly round circles thru the entire area. The circles are the most interesting, they are arranged in rows, each slightly offset from each other.

This may be a bit far fetched, but what could have happened is the light came in normally, reflected off of the sensor and made an impression on a small amount of water vapor in the lens. This water vapor (and the optics of the then reversed lens) magnified the array of sensors. Over the length of time the exposure was taken, this magnified impression of the sensor would have been itself recorded and reflected. This positive re-enforcement helps to explain the greater density in the center.

How likely the above is would depend on the humidity of the area you were in, how cold the camera had been previous to the shoot, the aperture and probably other factors as well. But mainly I'm just speculating on what could result in what is seen.

David


This sounds like a winner. Even thou I have no clue what it means, it just sounds neat.

Sorry I couldn't add any real help :(

Message edited by author 2006-07-14 14:40:50.
07/14/2006 02:47:44 PM · #16
Here is a Square 640x640 crop. Looks like maybe light and noise???
' . substr('//images.dpchallenge.com/images_portfolio/22970/thumb/363670.jpg', strrpos('//images.dpchallenge.com/images_portfolio/22970/thumb/363670.jpg', '/') + 1) . '

NO adjustments just crop. Notice some of the red is in front of the stars and some are behind.

Message edited by author 2006-07-14 14:49:33.
Pages:  
Current Server Time: 09/22/2021 12:54:22 AM

Please log in or register to post to the forums.


Home - Challenges - Community - League - Photos - Cameras - Lenses - Learn - Prints! - Help - Terms of Use - Privacy - Top ^
DPChallenge, and website content and design, Copyright © 2001-2021 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Proudly hosted by Sargasso Networks. Current Server Time: 09/22/2021 12:54:22 AM EDT.