Cut Off Bokeh?

Started Aug 27, 2014 | Discussions thread
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alxtng New Member • Posts: 6
Cut Off Bokeh?

The picture I noticed it on is here:
https://flic.kr/p/oDqT4p
(the subject of the photo is irrelevant).
I noticed the bokeh circles were being cut off. Ive read about how it is something with off the mirrors reflect the light inside the body? Ive also heard that I could be optical vignetting.

Anyone have an explanation for what happened and/or know of a way to prevent it?

 alxtng's gear list:alxtng's gear list
Nikon D90 Sony Alpha NEX-F3 Nikon AF-S DX Nikkor 55-200mm f/4-5.6G VR Nikon AF-S DX Nikkor 18-55mm f/3.5-5.6G II Nikon AF Nikkor 50mm f/1.8D +1 more
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