Normally you get a lens for the price only from China of no-name producers.
Very good, very precise workmanship especially with regard to the screw thread.
I use the lens in indoor and outdoor shots at close range with a 18-55mm lens. It provides distortion-free images - even at the edges. The gain resulting from wide angle I would rate 20% +.
For lenses from 55-250mm is useless. The pictures are foggy or blurred.
