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My K mount Vivitar 28mm f2.8 is breddy gud. Got it for free as a gift from a friend who found it at an estate sale for $2.
Didn't know what mount it was until a couple years later when I got a Pentax P3n to play with. It's not the sharpest thing in the world but it works and it was free so I can't complain.
Pic is a sunset I took on Ektar with it a few months back