Great little lens! Used extensively, has a lot of character. by character, i mean it flares uncontrollably sometimes, it vignettes, it doesn't hit infinity, so i had to use a paper spacer on the back, it has focus blurs out towards the edges and it has highlight halos. the lens is a single element with a simple screw focus. it's literally only 3 parts, the mount, the barrel and thew glass, which i think is actually plastic. but i'm really not kidding, i love using it, the photos and video on my 1 " sensor camera are gorgeous. it will come packed in a box for a different lens, just it's what i have.