Re: crazy OOF shape

bjw@xxxxxxxxxxxxxxxxx wrote:

Paul Furman wrote:

This is a screen shot from a movie showing some really wacky gear shaped
bokeh out-of-focus circles:
<http://www.edgehill.net/1/?SC=go.php&DIR=Misc/misc-photos/temp&PG=1&PIC=2>



That's what an iris diaphragm looks like when the leaves get
slightly offset from where they are supposed to be.  The "notch"
in the gear is the end/corner of the leaf, which normally
should be overlapped by the next leaf over.

So it's a broken lens, like they tried to stop it up wider than the lens was designed for. Those are really huge OOF circles too. I might guess the faster the lens, the larger the OOF circles?
.