Canon has announced a new ultra-wide angle lens for the EOS R mirrorless camera system. The first L-series lens to feature a Stepping Motor (STM), the RF 10-20mm f4L IS STM offers the widest angle yet for the RF mount (bar the specialist Dual fisheye lens) along with near-silent operation. Taking its cue from the professional EF 11-24mm f4L USM lens, this new design shaves 2cm in length and width off the dimensions, as well as more than 50% of the weight. Coming in at 570g, the RF 10-20mm f4L IS STM lens is compact and easily handholdable even for challenging conditions, thanks to the latest Peripheral Control Image Stabilisation (IS) technology and 5-stop optical image stabilisation, which increases to 6 stops when combined with a camera with in-body image stabilisation (IBIS). The optical design of the lens overcomes the potential problems of such wide angle focal lengths, with the use of Ultra-low Dispersion (UD), Super UD and GMo aspherical lenses, plus various lens coatings to red
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