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Serenar
!m827jEgWi.
Avenon/Kobalux lenses were made by a rather short lived Japanese optical company, YK Optical, in the last couple decades - they're all rather recent, and increasingly rare because the company folded.
3.5 is reasonable (for my purposes, dunno about yours), and the lens is supposed to be otherwise excellent. Check the links here: http://camerapedia.org/wiki/Avenon
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