[davidmanze]

Samyang/rokinon 8mm fisheye is dirt cheap, you won't regret it

+1 

 I second that, if your not wanting to shoot at less than F8 (F9-11 is optimum) you won't regret the Samyang,  it's images are very sharp and sparkling, but it's real plus is the almost total resistance to flare, even into the sun you get only one or two small points.  It's also very well made. I think Pentax and Nikon models contact with the camera. 

 

  A bargain!