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FORUMS Photography Talk by Genre Critique Corner 
Thread started 25 Nov 2012 (Sunday) 20:43
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Slow Sync Flash

 
morph2_7
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Nov 25, 2012 20:43 |  #1

This is my first attempt at slow sync flash to capture light trails and freeze the moving object with 2nd curtain flash. Why does the horse and carriage appear as ghost image?

Is the flash power too low? Is the object out of flash range? I can't remember the distance between the camera and the object but my wild guess is it's at least 25 feet (I'm very bad with distances so I could be completely off). I was standing on the sidewalk on a 2-way street in Riverside, California.

Settings are as follows:
Rebel T2i, 11mm, ISO100, f/8, 2 sec. Second curtain flash.




  
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Fire0725
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Nov 25, 2012 21:22 |  #2

I love it! I love the modern feel of the lights against the ghost of the horse drawn carriage! Well done! :D


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Nov 25, 2012 21:33 |  #3

My guess is that the flash power is too low for f/8 at that distance.


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gonzogolf
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Nov 25, 2012 21:33 |  #4

Its ghosted because its underexposed and because of the time exposure the things behind it are already exposed.




  
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morph2_7
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Nov 25, 2012 22:26 |  #5

Thanks Fire0725 but I wasn't going for the ghosted look but if you like the way it turns out, I guess that might work for me too :-)

PhotosGuy and Gonzogolf,
I remember cranking up flash expsoure compensation by +2 for that shot so the flash is already at its max output. I guess one option for me is to get closer to the object to make it appear as a whole, right?




  
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Northwoods ­ Bill
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Nov 25, 2012 22:30 |  #6

It might not be the image you had planned but it is a very cool image. Nice job


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Tiberius
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Nov 26, 2012 02:47 |  #7

morph2_7 wrote in post #15289020 (external link)
Why does the horse and carriage appear as ghost image?

Because they aren't at that point in the frame for the entire exposure. At any time when the shutter is open and the horse and carriage are not in that location, whatever's behind them will expose on the sensor. This leads to the background showing up, even through the horse and carriage.

To prevent them from being a ghost image, you need to do one of three things.

  • use a faster shutter speed
  • Make sure they do not move during the exposure
  • have the background behind them completely black so there is nothing to show through them.

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Nov 26, 2012 05:15 |  #8

morph2_7 wrote in post #15289020 (external link)
Why does the horse and carriage appear as ghost image?

Probably the same reason there are no cars in this image...

http://www.flickr.com …157627629180285​/lightbox/ (external link)

This was a 5 minute exposure and I was not expecting this. I was expecting lots of multi-colored streaks in this shot. But what I got was a deserted highway on a very busy day. :)


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morph2_7
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Nov 26, 2012 10:43 |  #9

Northwoods Bill wrote in post #15289433 (external link)
It might not be the image you had planned but it is a very cool image. Nice job

Thank you Bill.

Tiberius47 wrote in post #15289947 (external link)
To prevent them from being a ghost image, you need to do one of three things.

  • use a faster shutter speed
  • Make sure they do not move during the exposure
  • have the background behind them completely black so there is nothing to show through them.

You might have missed the point. I'd like to capture light trails and freeze the moving object with a flash firing right before the 2nd curtain closes. I don't think I can get that effect if I do one of your suggested actions.




  
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morph2_7
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Nov 26, 2012 10:46 |  #10

CameraMan wrote in post #15290142 (external link)
This was a 5 minute exposure and I was not expecting this. I was expecting lots of multi-colored streaks in this shot. But what I got was a deserted highway on a very busy day. :)

I'm surprised there is no trails of light. Did you take it with a 10-stop (or darker) ND filter during daytime? Perhaps cars don't have their lights switched on at the time so you didn't capture any light streaks.




  
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rivas8409
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Nov 26, 2012 11:40 |  #11

Even though it wasn't what you were after that's a pretty cool effect that can be used to make some pretty interesting images...if you understand how it worked.


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Nov 26, 2012 12:12 |  #12

morph2_7 wrote in post #15291039 (external link)
I'm surprised there is no trails of light. Did you take it with a 10-stop (or darker) ND filter during daytime? Perhaps cars don't have their lights switched on at the time so you didn't capture any light streaks.

It was taken during the day. If I recall there were cars with day time running lamps on (required on cars 1995 and newer I believe) and I used a piece of #12 shade welding glass for this shot. This allowed for the 5 minute open shutter.

I was expecting to see trails of light or cars but what I got was a barren highway. With this result I also got some pretty cool downtown Atlanta shots of seemingly deserted highway.


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Nov 26, 2012 12:17 |  #13

CameraMan wrote in post #15291339 (external link)
I was expecting to see trails of light or cars but what I got was a barren highway. With this result I also got some pretty cool downtown Atlanta shots of seemingly deserted highway.

My only trip through Atlanta was near rush hour, I prayed for something akin to a deserted highway.




  
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Nov 26, 2012 12:42 |  #14

gonzogolf wrote in post #15291359 (external link)
My only trip through Atlanta was near rush hour, I prayed for something akin to a deserted highway.

You mean like this? :)

http://www.flickr.com …/in/set-72157627629180285 (external link)

I'd LOVE to do this in Chicago whenever I go back up there to visit.


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Nov 26, 2012 13:06 |  #15

The mission Inn is only a couple blocks from my house but with the huge crowd I didn't even want to bother.

Went last year with a point and shoot and even then it was troublesome!


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Slow Sync Flash
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