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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 13 Aug 2009 (Thursday) 14:37
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Why is my DIY heart bokeh upside down, but others aren't?

 
Guts311
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Aug 13, 2009 14:37 |  #1

Hey there, I did the DIY heart bokeh from here: http://www.diyphotogra​phy.net/diy_create_you​r_own_bokeh (external link)

and even though they don't mention it in the DIY, I have to turn the heart filter I made upside down to make the heart bokeh show up right-side up in the final image. Not only did the DIY not mention needing to do this, but I also made another filter earlier and tried it on my friend's camera (same setup: 50d with 50mm f/1.8) and I'm like 90% sure I did not need to turn it upside down for his to work!

What's goin on?? ?




  
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Synenergy52
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Aug 13, 2009 15:19 |  #2
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I gotta give that a try, thanks for the link. Never got around to it. Good for pictures for the girlfriend...


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Todd ­ Lambert
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Aug 13, 2009 15:27 |  #3

Try holding the camera upside down...

j/k - I have no idea.. just being a smart ass.

8-)




  
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Guts311
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Aug 13, 2009 15:33 |  #4

I mean obviously it's due to the image coming in and being flipped by the prism/mirror (although I don't get why the bokeh would show up upside in the final..maybe the light blur shape gets captured before the flipping and never gets flipped??),
but it really doesn't make sense that the blur wouldn't get flipped in the final... anyone?




  
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Guts311
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Aug 13, 2009 16:01 |  #5

that's weird..I got a subscription e-mail for another reply in here, but it's not here!! ???




  
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Scottes
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Aug 13, 2009 16:10 |  #6

Guts311 wrote in post #8454618 (external link)
that's weird..I got a subscription e-mail for another reply in here, but it's not here!! ???

Sorry, that was me I think. I replied, then realized that my words had been said already, so I deleted my reply. I guess that I didn't delete it fast enough...


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20droger
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Aug 14, 2009 00:34 as a reply to  @ Scottes's post |  #7

Your heart bokeh is upside down because of the lens construction. The bokeh mask is right at the front of the lens, but with many lenses, the rear nodal point is well ahead of the front element.

The image is always flipped, i.e., is upside down on the sensor. If the cutout is behind the nodal point, the bokeh it produces will not be flipped, as flipping has already taken place.

With other lenses, the rear nodal point is within the body of the lens. With such a lens, the bokeh will be flipped along with the image.




  
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Guts311
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Aug 14, 2009 02:35 |  #8

Thanks!




  
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Why is my DIY heart bokeh upside down, but others aren't?
FORUMS Photography Talk by Genre General Photography Talk 
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