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16mm Strange lens distortion


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#1 Eric Moers

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Posted 08 June 2009 - 03:53 AM

I recently finished a shoot that was supposed to be this Lynchian/surrealist type of thing.

Anyway, we were using an old Arri 16BL with the standard 12-120mm angenieux, wide open at 2.5, with Vision3 500T.

As you can see we had very little light, however in watching the dailies, the out of focus city lights have a strange, "teardrop" like shape that changes and becomes spherical when the camera moves. Anybody know what this might be?


2_g1_0082.jpg



5_g1_017.jpg
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#2 Eric Moers

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Posted 08 June 2009 - 04:11 AM

Here's a link to some of the other frames, where you can make out he shape a little easier.

http://photobucket.com/lensdistortion
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#3 Chris Millar

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Posted 08 June 2009 - 07:57 AM

bokeh

at the extremities of the frame the circle (or hexagon, whatever...) that your iris makes becomes more and more a projection of a circle viewed from an angle - ovular so to speak.

Zoom lenses due to the design can truncate this due to the fact they are more barrel like.

Open up your lens speed wise and then have a look down it, move it round - notice the similarities of the shape of the bit you can see through and the shapes you see in the bokeh ?
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