True 180degree fisheye lens,best service and fast delivery. 37mm Fisheye Conversion Lens with marco Jollystar Optics 37mm 0.25x lens is a fisheye conversion lens that attaches to the front of an existing lens, to be used with 52mm filter thread lenses or Series 37 adapter rings. It can also be used as a 12.5x Macro lens, by unscrewing the back element, and using that part on its own. ...