The Samsung 50-150 mm f/2.8 is heavy and solidly built, with a combination of metal and high-quality plastics. It goes without saying that this professional lens is extra-well sealed against dust and splashwater. A tripod collar, sun cap and a lens bag are included. Samsung is a South Korean brand, but to my surprise, the metal mount reads "Made in China."
Otherwise, the lens’s exterior is comprised of an all metal build that works incredibly well for what it is. The metal is very smooth to the touch and we wish that it were a bit more textured for grip reasons. However, the lens also has a massive focusing ring that can be gripped with no trouble. Read more at http://www.thephoblographer.com/2014/12/26/review-samsung-50-150mm-f2-8-ois-samsung-nx-mount/#qBIktTl34lXQv8kW.99