Canon's remarkably light RF 70-200mm f/4L with internal zoom — barrel never extends — and 5.5-stop IS.
The Canon RF 70-200mm f/4L IS USM was released in 2020 as the RF system's compact telephoto zoom at f/4, featuring a retractable inner barrel that collapses to a shorter transport length than the extended shooting position. At 695g it is lighter than the EF 70-200mm f/4L IS II USM (760g) despite including stronger IS rated up to 5 stops. L-series dust and moisture sealing is built throughout. Ring USM provides fast, quiet AF.
The optical design uses 16 elements in 11 groups. Nine aperture blades produce smooth bokeh. The 77mm filter thread is the Canon L-series telephoto standard. At 695g the lens is relatively compact for an L-series telephoto zoom with IS. Minimum focus distance of 0.6m throughout. IS provides up to 5 stops of compensation, cooperating with body IBIS on IBIS-equipped RF bodies. Ring USM provides fast, quiet AF with full-time manual override. Constant f/4 aperture throughout. The inner barrel must be extended before shooting.
The RF 70-200mm f/4L IS USM's collapsible design and 695g weight make it the most practical telephoto zoom for travel-focused R-system photographers: lighter than the f/2.8 version by approximately 600g and shorter in transport configuration. IS at 5 stops provides excellent handheld telephoto stability for stationary subjects — equivalent to a claimed 1/200s shot at the 200mm equivalent of a tripod-supported exposure. For wildlife, portrait, and event photography where f/4 is adequate, the light weight is a meaningful practical advantage.
On the used market the RF 70-200mm f/4L IS USM is available at mid-range L-series telephoto pricing. Condition checks: IS operation, ring USM response, retractable barrel mechanism for smooth extension, L-series sealing, and front 77mm element for marks. The RF 70-200mm f/2.8L IS USM provides f/2.8 at approximately double the weight and cost. Compatible with all Canon RF-mount bodies.