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Long Exposures with Strange Image...?
Oct 10, 2020 06:04:00 #
All,
I hope someone can explain the odd images at the right of these photos.
One was taken with no cars passing (10 second exposure), and there is no image. An exposure with just one or two cars (8 seconds), has a faint image. The more cars passing through the frame (8 seconds), the stronger the image. There was no filter on the lens, lens was cleaned, sensor was cleaned using menu option, steady shot off. The shots were taking using a remote release with a Sony A6000.
Could there be a scratch on the lens that is having a stronger effect with more light (car head & tail lights)? I can't see anything. I'm baffled.
Thank you.
I hope someone can explain the odd images at the right of these photos.
One was taken with no cars passing (10 second exposure), and there is no image. An exposure with just one or two cars (8 seconds), has a faint image. The more cars passing through the frame (8 seconds), the stronger the image. There was no filter on the lens, lens was cleaned, sensor was cleaned using menu option, steady shot off. The shots were taking using a remote release with a Sony A6000.
Could there be a scratch on the lens that is having a stronger effect with more light (car head & tail lights)? I can't see anything. I'm baffled.
Thank you.
Oct 10, 2020 06:25:27 #
Light passing thru a lens can be tricky. Presuming that the center image is the one where no cars passed, I see a clean image. Because of the very bright street lamp in the image, I'd say the the "ghosting" was caused by that light reflecting off of the shiny surfaces of the cars.
Oct 10, 2020 06:33:59 #
cameraf4 wrote:
Light passing thru a lens can be tricky. Presuming that the center image is the one where no cars passed, I see a clean image. Because of the very bright street lamp in the image, I'd say the the "ghosting" was caused by that light reflecting off of the shiny surfaces of the cars.
Thank you for your reply. But do I have to live with this? I've shot from an overpass and with strong traffic in both directions and the image is always just on the right.
-s.
Oct 10, 2020 06:38:35 #
Siena wrote:
All, br br I hope someone can explain the odd im... (show quote)
It's a reflection of the bright streetlight off the cars. The "strobe effect" is the dead giveaway.
Oct 10, 2020 06:41:50 #
Gene51 wrote:
It's a reflection of the bright streetlight off the cars. The "strobe effect" is the dead giveaway.
Thank you Gene. Guess I'll have to watch out for streetlights in the future.
-s.
Oct 10, 2020 07:18:29 #
cameraf4 wrote:
Light passing thru a lens can be tricky. Presuming that the center image is the one where no cars passed, I see a clean image. Because of the very bright street lamp in the image, I'd say the the "ghosting" was caused by that light reflecting off of the shiny surfaces of the cars.
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Oct 10, 2020 08:05:07 #
Siena wrote:
Thank you Gene. Guess I'll have to watch out for streetlights in the future.
-s.
-s.
But I don't deserve credit. I posted my response before I read the others. Cameraf4 got it right.
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Oct 11, 2020 07:40:11 #
When you have lemons, make lemonade. Why not center that ghost image and make that the focal point of the photo? 
Oct 11, 2020 08:22:34 #
jerryc41 wrote:
When you have lemons, make lemonade. Why not center that ghost image and make that the focal point of the photo?
That's a great idea, Jerry. Thanks!
Oct 11, 2020 09:07:56 #
cameraf4 wrote:
Light passing thru a lens can be tricky. Presuming that the center image is the one where no cars passed, I see a clean image. Because of the very bright street lamp in the image, I'd say the the "ghosting" was caused by that light reflecting off of the shiny surfaces of the cars.
Oct 11, 2020 09:35:51 #
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Oct 11, 2020 10:09:34 #
Left hand streetlight shows a similar mystery light reflection. Moving car headlights striking the light and surrounding bushes perhaps.
Oct 11, 2020 11:06:51 #
I was also thinking this is like image stacking to a great degree. You shot for 10 seconds, the image is as if you combined all the light from many, many regular exposures. The car or cars wers only in the image for short periods depending on their speed and get averaged out. Also, cars are dark and their lights would be mostly perpendicular to the image plain.
I have a telescope which automately does image stackimg. I have watched a plane trail disappear as more images are added. I have been able to stack more than 1500 images over a night, so with a plane is averaged out as if it were noise.
I have a telescope which automately does image stackimg. I have watched a plane trail disappear as more images are added. I have been able to stack more than 1500 images over a night, so with a plane is averaged out as if it were noise.
Oct 11, 2020 11:14:31 #
On a second look, you can see the stricks from the car lights, especially the red, more compact, less diffuse tail lights, which don't average out well. I bet the road surface is also more lit than would be expected from just the building or street lights. It would be interesting to repeat the experiment using video and examining the individual frames and a stacked image made from a group of frames.
Interesting effects, like the cars were made invisible, but left their lights on.
Interesting effects, like the cars were made invisible, but left their lights on.
Oct 11, 2020 12:30:30 #
Did you have a lens hood on? Light from outside the field of view that hits the front element can cause strange affects.
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