This article is from the Yashica SLR FAQ, by cg@evrl.xs4all.nl (Cees de Groot) with numerous contributions by others.
Yashica shares its mount with Contax, which means that you can use
Contax Zeiss T* lenses, which are rated most of the time somewhere
between Nikon and Leica (or above Leica). Furthermore, most
aftermarket brands support the Y/C mount so you can add Tamron,
Tokina, Vivitar and Sigma lenses to your system. I've seen lots of
lenses by Sun, a now-gone aftermarket producer; my Sun 135/2.5MC seems
to perform well. The Big Four aftermarket brands are in various states
of ending their MF offerings, inform for yourself.
This FAQ will only discuss Yashica lenses.
 
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