What is the difference between shooting with an aperture of f/2.8 and a shutter speed of 1/1000s and shooting with an aperture of f/16 and a shutter speed of 1/30s? These and many other questions are answered with the easy to understand 123di interactive simulator. Learn how aperture and shutterspeed affect exposure, depth of field, and motion blur in the various exposure modes using the unique interactive learning based on the 123di of digital imaging interactive learning suite.