Summary: Its a bit heavy on the lens but if you have one with internal focusing its nothing to worry about. Its not like a fisheye so it doesn't make the image into a circle, however there is some very noticeable vignetting. Also when you zoom in there will be some image distortion which depending on the shot could be kinda cool.
Summary: Likes: -The adapter is made of a solid metal construction and feels high quality in the hand. -Macro lens is great in quality of photos and build. -The Wide Angle portion (macro+front glass element) is pretty good for the price point. -The adapter has a front 82mm filter thread. Dislikes: -The front lens element was loose, however it was an easy fix simply by turning the element to the right locking it in place.
Summary: I have a 20mm lens and I thought I could add this to it and get a cheapo 9mm lens, because 20mm * .45 equals about 9... Because I wanted to get even wider than my 14mm could go, on a particular subject. When you crop out the vignetting this lens produces, however, it seems at most to take the 20mm down to about 16mm. I do have a full-frame DSLR and this may be the problem. Also, it's possible that the macro feature will be of some use.
Summary: For the price it is not bad. But if you expect good "wide angle" forget it. If you expect perfect "macro" forget it. But if you are a novice (like me) this was not a waste of money. Top end lenses are out of my reach at the moment. The Wide Angle must be used with the Macro.