Sigma’s 24-70mm Art lens for Canon and Nikon DSLRs is solidly built with a metal barrel and a weather-seal gasket on its brass mounting plate. The zoom and focus rings operate with smooth precision, ...

The ‘AF-S’ edition puts that to rights with speedy ring-type ultrasonic autofocus and 4-stop VR ... Massively undercutting the likes of Canon and Nikon's own-brand 500mm f/4 super-telephoto primes for ...

Nasha is a Managing Editor for CNET, overseeing our sleep and wellness verticals. She is a nutrition, mental health, fitness and sleep science enthusiast. Her passion for mindful and holistic ...

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Jan. 15, 2025 — Researchers have designed process that uses ultrasound to modify the behavior of cancer-fighting T cells by increasing their cell permeability. They targeted freshly isolated ...