Canon's ultra-compact 600mm for RF mount — fixed f/11 diffractive optics with IS in an incredibly light package.
The Canon RF 600mm f/11 IS STM launched in 2020 alongside the RF 800mm f/11 as revolutionary super-telephoto lenses. Using diffractive optics and a fixed f/11 aperture, Canon achieved 600mm reach at just 930g — transforming who can access super-telephoto photography.
Optically good for the concept — sharp in the centre with acceptable performance across the frame. The fixed f/11 aperture requires bright conditions or high ISO, but modern Canon sensors handle high ISO well. IS provides approximately 5 stops. STM motor for quiet AF.
Canon RF mount with 82mm filter thread. Just 930g — extraordinarily light for 600mm. Extends when deployed from a compact retracted position. 1.4x and 2x extender compatible for 840mm f/16 and 1200mm f/22. Minimum focus distance 450cm.
Available used at mid-range prices. The concept was revolutionary — making 600mm accessible to anyone. The f/11 limitation is real — requires good light. The extending barrel is unusual but functional. For wildlife and bird photographers who want extreme reach without extreme weight or cost.