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.
Compare Canon RF 24-105mm f 4-7.1 IS STM Lens vs Canon RF 24-105mm f 4 L IS USM Lens vs Panasonic Lumix S5 Mirrorless Camera

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.

Compare Canon RF 24-105mm f 4 L IS USM Lens vs Canon RF 24-105mm f 4-7.1 IS STM Lens vs Canon Control Ring Mount Adapter EF-EOS R vs Canon Mount Adapter EF-EOS R Cr4q8.
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    • canon rf 24 105mm stm vs usm