The price of perfection – why I would lug the 3-pound Sigma 135mm f/1.4 portrait lens

Sigma's bokeh master is a hefty and pricey bit of glass, but it can shoot some of the dreamiest portraits you'll see ...

Sigma Lithium's waste piles offer no 'imminent risk' says Brazil's mining regulator

By Fabio Teixeira RIO DE JANEIRO, Feb 3 (Reuters) - Sigma Lithium's waste piles at a Brazilian mine offer no "imminent risk" ...

Sigma Lithium rises after resuming production in Brazil; BofA upgrades

Sigma Lithium said it resumed mining activities at its Mine 1 in Vale do Jequitinhonha in Brazil, concluding the restructuring of mining operations aimed at increasing operating efficiency.

Sigma Lithium Sells Additional 100,000t of High Purity Lithium Fines; Mining Remobilization Proceeding as Planned; Categorically Responds to Inaccurate Media …

HIGHLIGHTS Sigma Lithium announces the sale of 100,000 tonnes of high purity lithium fines for a price higher than the ...
Washington Technology

Sigma Defense acquires Aries Defense to boost tactical edge capabilities

The transaction adds video and sensor integration expertise, while also marking Sigma’s third CJADC2-related acquisition in the past two years. Sigma Defense Systems has moved to strengthen its hand ...