Canon RF 28-70mm f/2.8 IS STM is a lightweight, compact standard zoom lens offering a bright f/2.8 aperture, optical stabilization rated at 5.5 stops, and video-oriented features. Weather sealing improves reliability in adverse conditions. Collapsible RF-mount design keeps the lens length to 92.2 mm and weight under 500 g. UD and aspherical elements deliver high sharpness. STM autofocus supports smooth focus transitions and reduced focus breathing, making it suitable for cinematic video.