I have this lens in Konica, Nikon and Canon mounts. I find it difficult to focus a lens this slow with a focusing screen that has any aids in the center. I use the Canon mount lenses more than the others. It I put it on an F-1 with an L D screen it's nice to use. I wish I had the lens in Minolta mount because the X-700 finder is so bright. My Konica mount lens needed to be tightened up. This is a pretty sharp lens for a zoom in its range but it's not made as well as a Canon FD or Nikkor lens.