Purchased this lens for about £20 in unknown condition. It was missing af screw that i don't need anyhow. The spring mechanism in aperture was faulty but I've managed to get it working again. I think I will need to look up how to adjust the infinity focus as it doesn't guitar reach infinity when wide open. The minimum focusing distance is 1m so not great but after that it only gets better. The lens renders good amount of detail but it's not too sharp for video. I like the bokeh and the transitions in and out of focus. It's a Apochromatic lens and the aberations seem to be well controlled. The longitudal aberations are definitely less controlled as there is a hint of added green on defocused areas behind focal plane.

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