Strange object behind rear element of 23/1.4 (at 2:00 position in photo)

Started Aug 22, 2014 | Discussions thread
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Strange object behind rear element of 23/1.4 (at 2:00 position in photo)

Just discovered this last night. I haven't seen any effect in my photos from it. I've tried shooting both at 1.4 and 16, with bright objects off to either side and in the center.

Any other ideas for tests? If it won't affect my photos, I'll just ignore it.

 sixtiesphotographer's gear list:sixtiesphotographer's gear list
Konica Minolta DiMAGE X1 Nikon D700 Fujifilm X-Pro1 Canon EF 50mm f/1.4 USM Canon EF 50mm f/1.8 II +10 more
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