Sigma's extreme 10x zoom — 50-500mm full-frame with OS stabilisation, nicknamed 'Bigma' for its size.
The Sigma 50-500mm f/4.5-6.3 APO DG OS HSM, widely nicknamed 'Bigma', launched in 2009 as an extreme 10x super-telephoto zoom covering 50-500mm on full-frame. It offered unmatched range in a single lens for wildlife and sports photographers who couldn't carry multiple lenses.
Optically acceptable for the extreme range — sharp in the centre at mid-focal lengths but soft at 500mm wide open. OS stabilisation provides approximately 4 stops — essential at 500mm. HSM motor is fast and quiet. APO designation with SLD glass helps control chromatic aberration.
Nikon F mount with 95mm filter thread — enormous. Weighs approximately 1970g — very heavy. No weather sealing. Full-frame coverage. Tripod collar included — essential at this weight. Minimum focus distance 50cm at 50mm, 180cm at 500mm.
Available used at mid-range prices. The 'Bigma' nickname reflects its enormous size and weight. The Sigma 150-600mm Sport or Contemporary are better choices for pure telephoto reach. The 50mm starting point is the unique feature. Check for smooth zoom and OS operation.