Sony's new FE 600mm f/6.3 GM OSS redefines super-telephoto prime lenses by achieving remarkable compactness and lightweight design—just 995g, making it the lightest in its class—while delivering high-end performance at a fraction of the cost of its f/4 predecessor. The lens balances practical handheld usability with professional-grade handling characteristics, though its modest aperture and $3,699 price point position it between more affordable zoom alternatives and premium primes.