This is the lens you recommend to your worst enemy, sit back watch and laugh Tripod only this one. A very long learning curve with this focal length, thankfully it focuses by a focus control knob rather than turning a focus ring. Very light touch is all that is needed to throw this from infinity to the closest focusing distance (15 meters). Extremely fast to focus for such a long lens (very clever of Canon). Finding the subject in the frame is darn hard to start with, but like anything, it all becomes second nature after awhile. Length: 577mm, Diameter: 154mm, Weight: 4,270g All the best folks. Danny.