This lens is of decent build and quality. For my 7D crop sensor camera the widest viewing angle (diagonal) is 167 degrees, which means that for full panoramas I have to shoot more frames. I did shoot photos with this lens and also Sigma 8mm. With cost of only 27% of Sigma it is delivering good quality images. The only thing is the lack of AF (not a big deal for a fish eye lens). As far as my experience with Overstock goes, it went very smooth, very reasonable price, prompt delivery.