RF-S 10-18mm F4.5-6.3 IS STM. STM motor: For smooth, fast and quiet autofocus. RF-S 18-150mm f/3.5-6.3 IS STM. RF-S 10-40mm f/4.5-5.6 IS STM. RF-S lenses produce a smaller image circle than RF lenses, which allows them to be smaller and lighter.
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