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Forums > Back > Sometimes I wish I could understand what drives them... Yongnuo 50mm f/1.8
wxr
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#6
01-09-2015, 12:40 AM
I would guess that the patent protection on the original design of these lenses has expired.

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Sometimes I wish I could understand what drives them... Yongnuo 50mm f/1.8 - by wxr - 01-09-2015, 12:40 AM

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