The purpose of Tack Sharp is to help you take control of camera image sharpness. As a tool for learning, Tack Sharp helps with understanding how camera settings change image sharpness. As a tool in the field, it helps with making quick decisions about camera settings. At its heart Tack Sharp is a specialized calculator that shows the range of sharp focus and the extent of blurring for different subjects in a scene. It uses tried and tested camera principles to take the guess work out of camera setup.