1.3. ISO explained - learn about ISO in less than 3 minutes - photo 1x1 the free photography course 2. The EFFECTS of APERTURE and SHUTTER SPEED in our free photography course - intro to the chapter 2.1. APERTURE and its EFFECTS Part I - see for youself how the aperture affects your photography 2.2. APERTURE and its EFFECTS PartII - learn to choose the right aperture for your photography 2.3. APERTURE and its EFFECTS PartIII - how to blur the background in portrait photography 2.4. SHUTTER SPEED and its EFFECTS PartI - freeze or blur your image - a photography experiment 2.5. SHUTTER SPEED and its EFFECTS PartII understand motion blur and use shutter speed to avoid it