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    Thread: What causes this effect?

    1. Member hi_racing's Avatar
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      10-08-2012 09:59 AM #1
      Just curious if I'm doing something wrong as I haven't noticed the effect before. Notice how the water drops near the top of the shot look different?

      This was shot in natural light - about an hour after sunrise. Handheld with our old 50mm 1.8.

      IMG_0383 by HI Racing, on Flickr

      I saw it a few weeks ago in different lighting conditions:

      Roadside Ribs by HI Racing, on Flickr

      Thanks for taking the time to look.
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      10-08-2012 10:19 AM #2
      Strange effect on the water drops, normally you'd be experiencing either contrast via DOF (depth of field) or Bokeh (google if you don't know it), but that rendering is a bit strange.
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    3. Member Willybudista's Avatar
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      10-08-2012 11:03 AM #3
      Ok what it happens here its basically depth of field, probably you shot at f1.8 or 2.0 and that will focus a very short plane in the scene, basically only the closest thing to you, everything a little further will look defocus ( bokeh effect) so there you have the response to your question

    4. 10-08-2012 12:56 PM #4
      guys if the lens has f1.8 why waste your time shooting it at anything else?
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    5. Member hi_racing's Avatar
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      10-08-2012 02:40 PM #5
      Thanks for the replies. Both of those were at f1.8.

      Here's another shot with that lens in shaded afternoon light (at f1.8) and it didn't have that effect:

      IMG_8754 by HI Racing, on Flickr

      I went back through my library and don't have many shots with similar lighting and subject matter. Friday was probably the last day for a while to get unfrozen water drops at sunrise around here for a while.
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    6. Member adrew's Avatar
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      10-08-2012 02:53 PM #6
      Quote Originally Posted by hi_racing View Post
      Thanks for the replies. Both of those were at f1.8.

      Here's another shot with that lens in shaded afternoon light (at f1.8) and it didn't have that effect:

      I went back through my library and don't have many shots with similar lighting and subject matter. Friday was probably the last day for a while to get unfrozen water drops at sunrise around here for a while.
      On the child one it is because your subject is far away. Fast primes blur out the background when shot wide open and focused close-up. Bright points of light like those water drops or Christmas lights generally give you some kind of effect. See how the image is focused on the lights in the foreground and the ones at varying distances in the background appear differently?


      The shape of the effect depends on the number/shape of the aperture blades in the lens.
      Improving the signal-to-noise ratio

    7. Member hi_racing's Avatar
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      10-08-2012 03:57 PM #7
      Thanks so much adrew! Much appreciated!
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    8. 10-08-2012 04:15 PM #8
      im feeling star bokeh

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    9. Member Willybudista's Avatar
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      10-08-2012 04:22 PM #9
      Quote Originally Posted by hi_racing View Post
      Thanks for the replies. Both of those were at f1.8.

      Here's another shot with that lens in shaded afternoon light (at f1.8) and it didn't have that effect:

      IMG_8754 by HI Racing, on Flickr

      I went back through my library and don't have many shots with similar lighting and subject matter. Friday was probably the last day for a while to get unfrozen water drops at sunrise around here for a while.
      It doesnt have that effect because your distance with the subject is bigger, the more distance with your subject the smallest the bokeh effect or DOF

    10. Moderator Basscase's Avatar
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      10-08-2012 04:26 PM #10
      This is a really strange bokeh.

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      10-08-2012 04:31 PM #11
      The interesting thing about your shot at the top is not just the normal blur (bokeh) from the shallow depth of field, but how the light being focused through the water drops is being captured. It seems that the light is coming back into focus the further away from the lens it gets. Pretty cool. I'm going to have to try and re-create that. Shallow DOF and water is always fun.



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    12. Member sonicGLI's Avatar
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      10-08-2012 07:36 PM #12
      Quote Originally Posted by ohsnappe2 View Post
      im feeling star bokeh

      Although that's technically not bokeh

      Bokeh is the quality of the OOF area, it's not the OOF area itself. Your stars are the OOF area. The quality of those stars would be the bokeh
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    13. 10-08-2012 11:15 PM #13
      technically, I wasnt really feeling it.

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    14. Member sonicGLI's Avatar
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      10-09-2012 12:42 AM #14
      Technically, you were

      feel·ing
         [fee-ling] Show IPA
      noun
      1. the function or the power of perceiving by touch.
      2. physical sensation not connected with sight, hearing, taste, or smell.
      3. a particular sensation of this kind: a feeling of warmth; a feeling of pain.
      4. the general state of consciousness considered independently of particular sensations, thoughts, etc.
      5. a consciousness or vague awareness: a feeling of inferiority.
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