When you look at lenses, you might focus (bad pun) on the focal length. However, most people don't deign to check on what having a 600mm lens really entails - though the shots may be picturesque, it's best we take a "chill pill" and look at how this value affects our shots! # Intro to Focal Length - Zoom Simply put, this is how far two light rays parallel to each other take upon hitting the lens to intersect. Still following? Alright, let's continue