First off: wow what a fun lens!!! My camera is a sony A 7r and with a novoflex adapter this lens just fits so nicely. 12 elements in 8 groups ranges from F4 to F22. It has 180 degrees of view in all directions but only produces a 22mm image circle. I haven't shot my feet yet...but shadows and camera strap have turned up unexpectedly (I am learning to expect them!!!). Its a great lens for teaching you to check the field of view, I am sure I will be caught out again. Heres my first lot of test photos: the first one was just to illustrate, to my self, why they call it barrel distortion. Looking at that picture, for me, is weird; while taking the shot I was terrified I was going to have the front element hit the map! The lens has the following built-in filters 1A-FLD-Y52-R60-80B-85 I used the R60 for the black and white shot and the FLD for the pylon picture. That Pylon picture was hard...... With the huge field of view it was, as can be seen. Hard to keep the sun out of the shot.