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Owner reviews: Vivitar 24 mm f/ 2 MC (Kino)
It's a cheap 24mm f/2. It's actually pretty well made, fairly compact, and gives decent IQ even wide open... although there is some glow from undercorrected SA until about f/2.8. Bokeh are not bad for this type of lens. Sharpens nicely when stopped down. Overall, pretty nice as a fast moderate wide on APS-C -- and not a lot of competitors in this price range.
Has the standard Kiron stuck-wide-open aperture issue... although I was able to (temporarily?) fix this one by stretching the spring to increase tension a little. In addition to the SA wide open, contrast wide open isn't great, and the lens is a bit prone to PF. Not as good on a focal reducer as by itself (field curvature?).
Behaves more like a wide "fast 50" than like a fast wide, which surprises folks. Probably deserves more respect than it gets.