Strange Micro 105 VR background

Started Feb 26, 2013 | Discussions thread
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Re: Strange Micro 105 VR background
In reply to R Vaquero, Feb 26, 2013

This is caused by mechanical vignetting of the OOF areas in the background near the edges of the frame. If there was some kind of bright point in the background towards the edge of the frame, it would appear elliptical as opposed to being perfectly round. The orientation of these ellipses varies with their position with respect to optical centre, and hence you get this spherical bokeh effect. Have a look at the below page:

Scroll down to the section on 'swirling bokeh'. It explains it rather well.

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