The L mount has opened up certain Leica lenses to many photographers and filmmakers, promising the company's legendary image quality in a variety of options. One such lens is the Vario-Elmar-SL 100-400mm f/5-6.3, which offers a versatile focal length for a wide range of applications, such as wildlife and sports photography. This excellent video review takes a look at the lens and the sort of performance and image quality you can expect from it in usage.