The Bigma — Sigma's legendary 50-500mm superzoom for Canon EF with OS and HSM.
The Sigma 50-500mm f/4.5-6.3 DG OS HSM is an extreme-range superzoom covering everything from standard to extreme telephoto in a single lens for Canon EF mount. Nicknamed the Bigma by users, its 10x zoom range eliminates lens changes entirely for wildlife, sports, and aviation photography.
Optical quality is respectable considering the extreme zoom range, with the OS (Optical Stabiliser) providing essential stabilisation at the longer focal lengths. The HSM autofocus motor is fast enough for tracking moving subjects. Performance is best in the middle of the range, with some softening at both extremes as expected.
Build quality is robust and necessarily large — this is a substantial lens that demands good technique and often a monopod or tripod at the telephoto end. The zoom ring is smooth across the full range, and the tripod collar rotates for easy portrait-to-landscape switching. Weather consideration is minimal, so care is needed in wet conditions.
On the used market, the Sigma 50-500mm offers extraordinary zoom range versatility at very competitive prices. For photographers who need maximum reach without carrying multiple lenses, particularly for airshows, bird watching, and safari photography, the Bigma provides a practical all-in-one telephoto solution.