Motion blur not quite like real camera motion blur - cycles I have been attempting to render a warehouse scene with a package moving down a conveyor belt, with the idea that I would get a motion blur that match what a still camera would get with a dragged shutter. The rest of the scene looks pretty good to me but the motion blur looks really weird. It looks more like a flash has gone off rather than  

I couldn't find a simple explaination (ie: one that my artist brain could wrap itself around!), so I am hoping someone here can give me a place to start.

Motion blur is checked. The shutter is set to 30.00. What am I missing to get the smoother blur across the box?
I figured out the answer: I had set two key frames in the timeline, moving the boxes in between the two. And, then I had set the green line to the last key frame. 

This meant that the boxes stopped on that frame. I needed to set the green line to a spot in between the two lines to show the blur on the motion of the boxes.

Simple!