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Owner reviews: Vivitar MC 19 mm f/ 3.8 Cosina
Quite small with decent IQ on both APS-C and FF. Viable as a compact ultrawide for FF. Focus is very smooth with little friction; feels very nice in use.
Not better than a modern APS-C kit zoom at 19mm on an APS-C sensor. Vignettes significantly, but gently enough to not be too disturbing. Has both field curvature and distortion -- which one would expect for a not-too-expensive old ultrawide. Front filter ring keeps unscrewing on my copy.
Really not much bokeh to speak of, but what's there is sort-of average. I paid a lot less for this than the $167 average price listed... more like $10. At that price, how could I have any complaints?