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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 02 Apr 2010 (Friday) 19:56
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Canon 50L bokeh bubbles out of shape? video inside!

 
WireWess
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Apr 02, 2010 19:56 |  #1

Hello :)

When i shoot with my Canon 50L on my 5d II i've noticed a change in shape in the bokeh bubble as soon as the "bubble" goes off center.
The strange thing is that i don't have this "problem" with my Canon 50mm F1.8 ?
It's getting worse when i open up the aperture.

Made a small clip with my 5d, watch the edge of the "bokeh bubble" when it gets to the edge of the frame!
http://www.vimeo.com/1​0644392 (external link)
I was just wondering if this is "normal" with the 50L on FF ?
What causes this effect?

Who can test this on his own cam?
I've used some christmas lights about 2 feet away from the cam.


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timeasterday
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Apr 02, 2010 20:43 |  #2

I don't know the technical terms but I think that would be expected as you look at the light rays coming in further from the center of the lens. You don't see a problem with the f/1.8? The circles all turn into footballs with the f/1.8 and in my opinion looks worse than the L.


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badgerW
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Apr 02, 2010 21:02 |  #3

Totally normal. You can see them with the 50mm f/1.8 as well. This happens to some extent with all lenses. OOF shapes that appear as circular in the center become more distorted at the edges.


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frankchn
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Apr 02, 2010 21:13 |  #4

Normal. This happens with the 85L as well.




  
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WireWess
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Apr 04, 2010 11:26 |  #5

@tim i ment that the bubbles are getting chopped off @ 50L and you don't see that with the 50 1.8
Thanks for the responses all :)

Should this effect get even worse or less due to the focal length?


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badgerW
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Apr 04, 2010 20:32 |  #6

Focal length should not make much of a difference. I think it has more to do with the design of the lens and the internal elements. IIRC, any lens wide-open will show more of this than when stopped down.


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semla
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Jan 01, 2011 22:43 |  #7

In the link below the explanation is that quote: "the mirror chamber of the SLR that Mike used is too small to support the speed of the lens".

http://toothwalker.org​/optics/bokeh.html (external link)




  
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Canon 50L bokeh bubbles out of shape? video inside!
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