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Bokeh With a "Target" Pattern?


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#1 Chris Keth

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Posted 25 March 2009 - 03:39 AM

I've been watching DVDs of the BBC series Torchwood and enjoying it. I've noticed this strange pattern in the out of focus points that I've never seen before. It's these concentric circles like a target or a fresnel lens.

I've grabbed a screenshot.

Posted Image

Any idea what lens or filter causes this? I've never seen or noticed it before.
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#2 Paul Bruening

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Posted 25 March 2009 - 10:39 AM

Cool. I have no idea. But, it's cool. A new bokeh thing?
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#3 Jason Debus

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Posted 25 March 2009 - 10:51 AM

For whatever it's worth my old Canon XL2 had this kind of bokeh. (condom bokeh?) From what I understand it's from etchings in the lens elements.
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#4 Saul Rodgar

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Posted 25 March 2009 - 02:14 PM

The other day I was taking macro pictures of the interior elements of my Pentax 50 mm f1.4 lens with a Fujinon lens and I noticed the same pattern. I was surprised as I had never noticed that effect before on either lens _both of which I have used quite extensively. I wonder which lens is producing the pattern, or is it a combination of the two ? . . Posted Image
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#5 Leo Anthony Vale

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Posted 26 March 2009 - 03:36 PM

Posted Image

Any idea what lens or filter causes this? I've never seen or noticed it before.


I think they're an older type of glass diffusion filter, maybe mitchell, which has concentric rings.

The image that slips in between the rings is sharp, while the image that goes through the rings is smeared over the sharper image.

An old photo magazine showed how to make your own with a UV filter and a tube of glue/cement.
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#6 Stuart Brereton

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Posted 26 March 2009 - 04:09 PM

I think they're an older type of glass diffusion filter, maybe mitchell, which has concentric rings.


I can say with some certainty that the only filtration used on this show was Black Promists, usually either a 1/8th or 1/4. The lenses in season one were Digital Primo zooms, in season 2 they switched to Canon Cine zooms.
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