With ring USM, the Canon EF-S 17-85mm f/4-5.6 IS USM Lens focuses very fast - and very quietly. FTM (Full Time Manual) focusing is enabled in AF mode. IS on this lens is also quiet while engaged. There is a noticeable click when IS is started and stopped, but only a quiet hum is audible while IS is functioning. Canon EF 70-200mm f/2.8L IS III USM Lens Canon EF 500mm f/4 IS II Lens Canon EF 50mm f/1.4 USM Lens Canon STM Lens Examples Mirrorless Lenses Canon RF 50mm f/1.8 STM Lens Canon RF 85mm f/2 IS STM Lens Canon RF 600mm f/11 IS STM Lens DSLR Lenses Canon EF 40mm f/2.8 STM Lens Canon EF 24-105mm f/3.5-5.6 IS STM Lens The Canon RF-S18-150mm lens F3.5-6.3 IS STM with the EOS R7 will have an estimated retail price of $1,899.00 3. The RF-S18-150mm F3.5-6.3 IS STM lens will be available for an estimated retail price $499.99 3, while the RF-S18-45mm F4.5-6.3 IS STM lens will have an estimated retail price of $299.99 3. All products will be available in late 2022. nKp1Fp8.