SUMMARY
Sigma's 50-120mm f/2.8 DC OS Contemporary lens is now available for Fujifilm X, Sony E, and Canon RF mounts, targeting APS-C photographers seeking a bright telephoto zoom. Weighing significantly less and costing about half as much as Fujifilm's 50-140mm, the Sigma lens offers a comparable focal range with some trade-offs. It features a clicked aperture ring, 22-point sunstars, and optical stabilization rated up to 6.5 stops. When paired with other Sigma f/2.8 zooms, it enables a constant aperture system from wide-angle to telephoto, making it a compelling option for compact APS-C kits.
TAKEAWAYS
Sigma's 50-120mm f/2.8 lens is a lighter, more affordable alternative to Fujifilm's 50-140mm for APS-C systems.
The lens weighs 390g, significantly less than the Fujifilm's 995g, and costs $799.
It offers a constant f/2.8 aperture and can be part of a three-lens kit providing a 15mm to 180mm equivalent range.
Autofocus is quiet and quick for stills, though video performance may vary by camera body.