Canon's ultra-compact RF-S ultra-wide with IS — just 150g with stabilisation and STM quiet AF.
The Canon RF-S 10-18mm f/4.5-6.3 IS STM is Canon's lightest ultra-wide zoom, covering 16-29mm equivalent on APS-C RF bodies. At 150g with built-in IS stabilisation, it makes ultra-wide photography accessible without bulk or weight penalty.
Soft in corners wide open but acceptable stopped down to f/8. IS stabilisation provides useful correction for handheld use. STM motor is quiet for video. 14cm close focus at wide end enables creative perspectives.
Canon RF-S mount, 49mm filter thread. 150g weight. IS optical stabilisation. APS-C only. No weather sealing. Plastic construction. EF-S 10-18mm IS STM is the optically similar predecessor.
Limited used supply as relatively new. Check IS mechanism and STM motor responsiveness. The slow f/4.5-6.3 aperture limits low light use. Best paired with R10 or R50 for compact ultra-wide travel kit.