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agenkin


Photograph Information Photographer's Comments
Camera: Nikon D50
Lens: Nikon AF Nikkor 50mm f/1.4D
Galleries: Candid, Black and White
Date Uploaded: Sep 26, 2006

Viewed: 730
Comments: 9
Favorites: 3 (view)

 //www.dpchallenge.com/forum.php?action=read&FORUM_THREAD_ID=470402
The results of panning in this picture (1/15s, f/1.4) puzzle me a bit. Why are the motion-blurred contours not blurred smoothly? Instead, they are repeated eight times.

My best guess is that the artificial lighting is to blame, and those contours coinside with the frequency of the alternating current. However, the frequency is 50Hz in North America, so at 1/15s I sould catch 3.3 periods. Since each period has two vertices, then there should be, at most, 6 contours replicated, but I am seeing 8.

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AuthorThread
 01/20/2007 04:19:17 AM
SHould have been for motion panning lmao
  Photographer found comment helpful.
 10/04/2006 09:09:17 AM
I see 8 1/2, just like Fellini. Love the picture anyway.
  Photographer found comment helpful.
 10/03/2006 09:07:07 AM
If you ever fiture out what you did, please write a tutorial. I'd love to be able to do that with the lines.

It also amazes me how you managed to get just the guy in the bicycle in focus and everything else, even the other cyclist, is about equally out of focus. Great stuff.
  Photographer found comment helpful.
 10/03/2006 03:48:50 AM
In a nutshell, do it some more !
This is a fabulaous black & white. It's alive and dimensional.
And it's now a favorite.
  Photographer found comment helpful.
 09/27/2006 08:42:04 PM
I like the sense of movement. The blur adds to the busy aspect of the image. Great high contrast as well.
  Photographer found comment helpful.
 09/27/2006 08:32:56 PM
Not so sure about this but, it is 60Hz not 50 Hz. in NA, that would give you 3.99 periods and assuming the light lit twice every cycle, 1+, 1-, that would be 8. Again, I am pulling this out of my ...

Anyway this is a very cool pic and the panning is very good.

Message edited by author 2006-09-27 20:33:38.
  Photographer found comment helpful.
 09/26/2006 01:26:07 PM
insanely cool!! really awesome work. wondeful choice of b & w
  Photographer found comment helpful.
 09/26/2006 01:24:38 PM
Originally posted by rjkstesch:
It would be 6 assuming that you caught it at the center of a cycle. If you started with a vertice and ended with a vertice, you would have 8 (2 ends plus the 6 in the middle).

I thougt about that. Suppose I caught one right at the opening of the shutter (time 0). Then there will be 3.3 more periods left to go. Since we have a peak each half period, so we have at most 6 more peaks to go. So, we should be getting at most 7 contours. I guess this is close enough for the explanation. Unless there is another explanation for the phenomenon.
 09/26/2006 01:17:05 PM
It would be 6 assuming that you caught it at the center of a cycle. If you started with a vertice and ended with a vertice, you would have 8 (2 ends plus the 6 in the middle).

That's how my logic goes anyway, and I'm out of my league with this topic. Becky
  Photographer found comment helpful.


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