Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Read More.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Photography Talk by Genre General Photography Talk
Thread started 20 Aug 2017 (Sunday) 14:10
Prev/next
sponsored links
(this ad will go away when you log in as registered member)

light trails & missing truck

 
Flywing
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 14:10 |  #1

A question please? I have found quite a bit of info on light trail and long exposure photography. Samples and how to do it but can't find any note on where the vehicles disappear to. Posted an image with it's crop to show the end of the trails where the truck should be, but we see the power pole on the opposite side of where the vehicle is. Just want to know why the camera sensor detects the light this way? Light reflected off the truck body should be recorded and yet seemingly not...

HOSTED PHOTO
please log in to view hosted photos in full size.

HOSTED PHOTO
please log in to view hosted photos in full size.


http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as registered member)
sidknee
Senior Member
sidknee's Avatar
Joined Mar 2010
South Gloucestershire, UK
Aug 20, 2017 14:13 |  #2

The truck is moving for the whole of the exposure time so it is never in any place long enough for the sensor to record it. The power pole on the other hand does not move at all.


Canon EOS 7D, EOS 7D Mark II, EOS M5 | Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF-S 10-22mm f/3.5-4.5 USM, EF 70-300mm f/4-5.6L IS USM, EF 50mm f/1.8 STM, EF-M 22mm f/2 STM | Sigma 70mm f/2.8 EX DG Macro EF, 150-600mm F5-6.3 DG OS HSM | C |

LOG IN TO REPLY
DreDaze
happy with myself for not saying anything stupid
DreDaze's Avatar
17,649 posts
Gallery: 17 photos
Joined Mar 2006
S.F. Bay Area
Aug 20, 2017 14:16 |  #3

you can try a little experiment yourself...set up your camera on a tripod with long exposure...take one shot running around, and another just standing...you may see some ghosting of you running around, but the truck is going a lot faster, so it doesn't show up at all


Andre or Dre
gear list
Instagram (external link)
flickr (external link)
my 366 for 2016 (external link)

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Post has been last edited 1 month ago by Flywing. 2 edits done in total.
Aug 20, 2017 15:09 |  #4

sidknee wrote in post #18432573 (external link)
The truck is moving for the whole of the exposure time so it is never in any place long enough for the sensor to record it. The power pole on the other hand does not move at all.

In that last instant when the shutter closes, the light of, or blur of, the truck reflects back and is the last thing recorded yet the pole is still evident. the light travels faster than the truck and in my small mind it should be seen.



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:11 |  #5

DreDaze wrote in post #18432574 (external link)
you can try a little experiment yourself...set up your camera on a tripod with long exposure...take one shot running around, and another just standing...you may see some ghosting of you running around, but the truck is going a lot faster, so it doesn't show up at all

Yes I've played with this in a graveyard. Ghostly effects...



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
sidknee
Senior Member
sidknee's Avatar
Joined Mar 2010
South Gloucestershire, UK
Aug 20, 2017 15:16 |  #6

Flywing wrote in post #18432618 (external link)
In that last instant when the shutter closes, the light of, or blur of, the truck reflects back and is the last thing recorded yet the pole is still evident. the light travels faster than the truck and in my small mind it should be seen.

If the truck is reflecting enough light to be recorded in the last instant of the exposure it will be reflecting enough to be seen in the whole exposure. It isn't so it doesn't.


Canon EOS 7D, EOS 7D Mark II, EOS M5 | Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF-S 10-22mm f/3.5-4.5 USM, EF 70-300mm f/4-5.6L IS USM, EF 50mm f/1.8 STM, EF-M 22mm f/2 STM | Sigma 70mm f/2.8 EX DG Macro EF, 150-600mm F5-6.3 DG OS HSM | C |

LOG IN TO REPLY
PhotosGuy
Moderator
PhotosGuy's Avatar
74,606 posts
Gallery: 2 photos
Joined Feb 2004
Middle of Michigan
Aug 20, 2017 15:17 |  #7

Flywing wrote in post #18432618 (external link)
In that last instant when the shutter closes, the light of, or blur of, the truck reflects back and is the last thing recorded yet the pole is still evident. the light travels faster than the truck and in my small mind it should be seen.

If you want the truck, put someone with a flash down at the end. Have them fire it when the truck gets there.


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1280 pixels on any side.

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:19 |  #8

sidknee wrote in post #18432630 (external link)
If the truck is reflecting enough light to be recorded in the last instant of the exposure it will be reflecting enough to be seen in the whole exposure. It isn't so it doesn't.

It should at least block the light reflected from the pole????



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
PhotosGuy
Moderator
PhotosGuy's Avatar
74,606 posts
Gallery: 2 photos
Joined Feb 2004
Middle of Michigan
Post has been edited 1 month ago by PhotosGuy.
Aug 20, 2017 15:21 |  #9

Flywing wrote in post #18432633 (external link)
It should at least block the light reflected from the pole????

Obviously it doesn't, unless it's parked in front of it for the whole exposure.


FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
New Image Size Limits: Image must not exceed 1280 pixels on any side.

LOG IN TO REPLY
DreDaze
happy with myself for not saying anything stupid
DreDaze's Avatar
17,649 posts
Gallery: 17 photos
Joined Mar 2006
S.F. Bay Area
Aug 20, 2017 15:22 |  #10

Flywing wrote in post #18432633 (external link)
It should at least block the light reflected from the pole????

the last pole is the same as the other poles...they are exposed for a majority of the time of the shutter being open...they probably are darker than what they would've been without the truck driving in front of them...but of the 4sec exposure, they were probably exposed for 3.75(random number) seconds...so the truck driving by doesn't matter


Andre or Dre
gear list
Instagram (external link)
flickr (external link)
my 366 for 2016 (external link)

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:24 |  #11

PhotosGuy wrote in post #18432631 (external link)
If you want the truck, put someone with a flash down at the end. Have them fire it when the truck gets there.

Or perhaps a very large torch so that I can coordinate with the shutter release. Thanks for that idea.



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:28 |  #12

Flywing wrote in post #18432640 (external link)
Or perhaps a very large torch so that I can coordinate with the shutter release. Thanks for that idea.

Maybe I'll forego the flash. Drivers could get miffed with some dolt bliding them...



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
CyberDyneSystems
Admin (type T-2000)
CyberDyneSystems's Avatar
47,544 posts
Gallery: 78 photos
Joined Apr 2003
Rhode Island USA
Post has been edited 1 month ago by CyberDyneSystems.
Aug 20, 2017 15:29 |  #13

It should at least block the light reflected from the pole????


Only for that instant that it was in front of it, which was too short of a time to effect the long exposure in the way that you are expecting it to.

Since you have correctly exposed fro the bright lights of the truck, your same exposure is far to short to gather the very minimal amount of light that the truck was reflecting.

Exif shows a 4 second exposure. You would need more like 1 minute (guestimating) to see the truck. At which point, the lights would be pure white blown out,.. you can;t ever do an exposure that will show both.


GEAR LIST
CDS' HOT LINKS
Jake Hegnauer Photography (external link)

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:34 |  #14

DreDaze wrote in post #18432639 (external link)
the last pole is the same as the other poles...they are exposed for a majority of the time of the shutter being open...they probably are darker than what they would've been without the truck driving in front of them...but of the 4sec exposure, they were probably exposed for 3.75(random number) seconds...so the truck driving by doesn't matter

a one frame video. I'm still seeing the truck and the light is brightly reflecting through the whole exposure. you're right.



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
Flywing
THREAD ­ STARTER
Goldmember
Flywing's Avatar
Joined Nov 2006
Edson, Alberta
Aug 20, 2017 15:40 |  #15

Thanks eh, semi clear here now.



http://flywing.smugmug​.com/ (external link)
The wild fish were as the wild air, no mans possession but the free gift of God." ---Arthur Ransome

LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as registered member)

795 views & 3 likes for this thread
light trails & missing truck
FORUMS Photography Talk by Genre General Photography Talk


Not a member yet? Click here to register to the forums.
Registered members get all the features: search, following threads, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, settings, view hosted photos, own reviews and more...


AAA

Send feedback to staff    •   Jump to forum...    •   Rules    •   Index    •   New posts    •   RTAT    •   'Best of'    •   Gallery    •   Gear    •   Reviews    •   Polls

COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Privacy policy and cookie usage info.

POWERED BY AMASS 1.4version 1.4
made in Finland
by Pekka Saarinen
for photography-on-the.net
Spent 0.00176 for 6 database queries.
PAGE COMPLETED IN 0.03s
Latest registered member is GESWhoPhoto
976 guests, 442 members online
Simultaneous users record so far is 6106, that happened on Jun 09, 2016