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16mm Strange lens distortion


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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?

 

 

post-31991-1244450992.jpg

 

 

 

post-31991-1244451034.jpg

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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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