Paul from Photo Genius decodes lens names like Nikon's 18-55mm f/3.5-5.6 G DX VR, diagrams focal length and field of view, and recommends by genre: Sigma 8-16mm and 12-24mm wide angles for landscapes, and Canon 55-250mm and Nikon 70-300mm telephotos for sport and wildlife, plus a monopod against shake.
