Shutterzoom

In Shutter priority Mode is a technique called panning. Panning is done by moving the camera from one side to the other, resulting in images that show motion. To pan successfully, you have to slow down shutter speed to a value lower than the inverse of your focal length. When you have a shot like this where the most important element that produces the shot is the shutter speed, you need to use shutter priority mode it just makes things simpler because you can adjust using just one dial, freeing you up to compose and make other creative decisions.

To do panning successfully, i have to slow down the camera. Set ISO to the lowest possible. 

Setting used for this shoot: 

Use Manual Focus

ISO: 200

Shutter Speed: 1/20