L2M1AP2 Canon Exercise: I was trying to have my three screen dumps show three different speed of propeller. Pic 1: good exposure (ISO 100), deep depth of field (aperture f 22), shutter speed 1 sec. (Need tripod). Pic 2: Good exposure (ISO 800), shallow depth of field (Ap f 3.5), shutter speed 1/250th. Good exposure (ISO 6400), shallow depth of field (Ap f 2.8), shutter speed 1/4000th.