I bought this fisheye to mount a 20mm E-mount pancake lens and my review is about a conversion fisheye lens and a 20mm lens together. YES, I know this converter lens works for 16mm, but I think it's important to share your experience with 20mm so you can make an informed decision. I got a 20mm lens with the Nex-6, so I chose that over the 16mm. With a 20mm lens, this converter lens gives you a 12mm field of view (the same look as a 16mm wide-angle converter). Lens). It's great for 20mm and the…