The Samyang company proved again that they employ very gifted optics specialists who, with a budget much lower than that of more renowned rivals, can offer a lot. That company have launched several lenses and I have to admit I haven’t encountered an optically weak device yet.
very good image quality in the frame centre,, good image quality on the edge of the frame,, excellent control of chromatic aberration,, moderate distortion,, slight coma,, decent astigmatism correction,, low vignetting in normal working mode,, the cheapest, fully-fledged T-S available on the market.
weak work against bright light,, unacceptable mechanics quality at this price point.