The Canon 20-35mm f/3.5-4.5 EF Ultrasonic is an autofocus wide-angle zoom for the Canon EF mount, covering ultra-wide to moderate-wide focal lengths on full-frame bodies. It uses a USM (Ultrasonic Motor) autofocus drive and was aimed at reportage, landscape and travel shooters wanting a compact wide zoom on EOS film and digital SLRs.

At recent UK auction, hammer prices for this lens have ranged from £35 to £94, with the two recorded sales straddling that span and giving a midpoint near £65 as of 2026. Condition is the main driver of what a copy sells for today: clean, fully working examples reach the upper end of that range, while scruffy or untested bodies tend to change hands at the lower end.