Recently bought one of these amazingly cheap completely manual lenses from Amazon Uk (£107) canon fit. Seems to be extremely similar to the Laowa 60mm lens which costs around £350. Build quality seems fine although it does have a rubber focus ring grip and the focus/magnification feels slightly sticky. Optically to lens seems to work fine. I used the canon version on my sony A6000 with adapter. I found the easiest way to use it for natural light shooting was to put the camera into manual mode set the aperture and shutter speed but put the ISO to auto but watch what the ISO values were.
Anyway the shots looked pretty good to me and as such the lens seems amazing value for the money.
