Canon RF mount lenses are designed specifically for EOS R series mirrorless cameras. RF 24-105mm F4 L IS USM: 77mm: Polarizer EF 24-105mm f/3.5-5.6 IS STM
Can get the RF 24-105mm f/4-7.1 IS STM for US$249.00 at USA Canon Refurbished Lens site; includes Canon 1-Year Warranty. Jon. Its sorta of your job to check that out but yes it is a 90 day warranty . Please give a source for 1 year warranty, I seemed to have missed it. I did see were they wanted money for 1 or 2 year coverage.
has a silent focus motor built into the lens. Canon EF 500mm F/4L IS II USM. Canon RF 800mm f/11 IS STM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.The Canon RF 24-50mm F4.5-6.3 IS STM Lens vs. RF 24-105mm F4 L IS USM Lens comparison shows theL lens weighing over 3x as much and measuring considerably larger. A larger lens typically uses larger filters, and 77mm vs. 58mm are the numbers in this case.
Canon RF 50mm f/1.8 STM Lens (Canon RF) B&H # CA5018RF MFR # 4515C002. Canon RF 24-105mm f/2.8 L IS USM Z Lens (Canon RF) B&H # CA2410528IS MFR # 6347C002.Canon STM lenses have very quiet autofocusing making them great for video but are slower at getting focus compared to USM lenses. STM has to do with Stepper Motor technology, and the power comes from the camera body, not from the lens itself. The Canon STM system was developed specifically for filming video.