"Shutter Stock is actually a photography term that refers to a photography website. Different photographers put their images on there, and you can pay to download photos."

Shutter

in photography a shutter is a devise that when opened allows light to pass through for a predetermined length of time and 'create a photograph'

high speed shutter photography

ur welcome

The minimum speed, i.e., the slowest the shutter will cycle, is B. The shutter will stay open for as long as the shutter release button is depressed. You can't get much slower than 'not moving'.