Canon's new mid-range RF zoom with constant f/2.8 and IS at a non-L price point.
The Canon RF 28-70mm f/2.8 IS STM was released in 2024 as Canon's compact constant-aperture standard zoom for the RF system, designed to provide constant f/2.8 throughout the standard range at lower cost and lighter weight than the RF 24-70mm f/2.8L IS USM. The non-L designation places it outside the professional weather-sealed tier while retaining constant f/2.8 aperture. Built-in IS and an STM motor for quiet video AF are included. The 490g body weight is substantially lighter than the RF 24-70mm f/2.8L IS USM at approximately 900g.
The optical design uses 15 elements in 12 groups. Nine aperture blades produce smooth out-of-focus rendering. The 67mm filter thread is smaller than the 77mm L-series standard — a dedicated filter set is required but the smaller diameter reduces cost and weight. At 490g the lens is the lightest RF constant-f/2.8 standard zoom option. Minimum focus distance of 0.27m at 28mm. IS is built in. STM motor enables near-silent continuous AF for video. Variable aperture maintains constant f/2.8 across the full 28-70mm zoom range.
The RF 28-70mm f/2.8 IS STM's practical positioning is as the accessible, lighter constant f/2.8 standard zoom for photographers who want f/2.8 aperture speed without the L-series price or weight. The trade-offs versus the RF 24-70mm f/2.8L IS USM are the narrower zoom range starting at 28mm rather than 24mm, no L-series weather sealing, and the lower optical tier. For event, portrait, and general photography where the 28mm starting point is sufficient and weight matters, the 490g body is more practical than the 900g L alternative.
The RF 28-70mm f/2.8 IS STM is a 2024 product; used availability is limited. Condition checks: IS engagement, STM motor response across the zoom range, and front element for any marks. The absence of L-series weather sealing is the primary limitation for professional outdoor use in variable conditions. The Canon RF 24-70mm f/2.8L IS USM provides the full 24mm starting point, L-series sealing, and higher optical quality at substantially higher cost. Compatible with all Canon RF-mount bodies.