High-quality telephoto lenses for DSLRs are tricky to buy. They're a huge investment, with prices starting at around £1,500 and heading sharply skywards. There are also considerable usability problems: long focal lengths require fast shutter speeds, which require large apertures, which all results...

The 120-300mm is a big big, bold and beautiful lens that is...

This 3390g behemoth of a lens fits snugly into Sigma's Sport line of glass and is designed to be mounted to a tripod rather than hand-held. This leads it to be rather more specialist than many lenses in test, though doesn't detract from its image quality.