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Owner reviews: Vivitar 20 mm f/ 3.8 Kino
Seems to be better than average IQ for an old ultrawide. Well made with buttery smooth focus. Looks really impressive on a camera.
I have two copies of this and neither one has a working aperture: both are stuck wide open (i.e., yup, it's manufactured by Kiron). Huge front to this heavy lens.
$200 average price? Both mine were much cheaper.