Canon's lightweight APS-C telephoto zoom for RF-mount with IS and quiet STM motor.
The Canon RF-S 55-210mm f/5-7.1 IS STM was released in 2022 alongside the RF-S 18-45mm as the telephoto half of Canon's two-lens APS-C RF-S kit, providing an 88-336mm full-frame equivalent range. The RF-S designation indicates an APS-C-only image circle; the lens is not suited for full-frame RF bodies without crop mode. IS is built in for handheld telephoto stability. The STM motor enables quiet continuous autofocus for video recording on RF-S APS-C bodies.
The optical design uses 11 elements in 8 groups. Seven aperture blades produce acceptable out-of-focus rendering. The 55mm filter thread is specific to this lens — distinct from the 67mm of the RF-S 18-45mm f/4.5-6.3 IS STM, requiring a separate filter set when pairing both lenses. At 270g the lens adds minimal weight to APS-C RF bodies. Minimum focus distance is approximately 0.73m at 210mm and 1.0m at 55mm. IS is built in for handheld telephoto stability. STM motor enables quiet continuous AF. Variable aperture runs from f/5 at 55mm to f/7.1 at 210mm. No weather sealing.
The RF-S 55-210mm's practical role is as the telephoto half of a Canon APS-C RF-S two-lens kit — paired with the RF-S 18-45mm it covers 29-336mm equivalent with no focal length gap. The 270g weight keeps the total kit light for casual carry. The f/7.1 maximum aperture at 210mm is slow; outdoor daylight exposure times are workable, but indoor and low-ambient photography at 210mm requires elevated ISO to maintain usable shutter speeds. IS extends handheld range for static subjects at the telephoto end.
On the used market the RF-S 55-210mm IS STM is available at low prices as the APS-C RF kit telephoto. Condition checks: IS engagement, STM AF motor response across the zoom range, and front element for marks. The 55mm filter thread requires a separate filter set from the 18-45mm kit lens. The Canon RF-S 18-150mm f/3.5-6.3 IS STM covers the full two-lens range in a single optic at a modest premium. Compatible with Canon APS-C RF-mount bodies (R7, R10, R50, R100); usable on full-frame RF bodies in crop mode.