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Since it first came onto the scene, the RF-S mount has struggled to find its place. With Canon’s need to fill out its lens lineup for its professional RF S mount cameras, lenses specifically made for the RF-S mount have been few and far between. The Canon RF-S 10-18mm F4.5-6.3 IS STM, however, has come along to fill a hole in the existing lineup for a compact, wide-angle lens for photography and vlogging to give RF-S cameras a boost.
Out of the three Canon RF-S lenses launched before this one, the Canon RF-S 18-45mm F4.5-6.3 IS STM has been the widest lens available for the RF-S mount used by cameras including the Canon EOS R50 or Canon EOS R7 –although the 18-45mm lens isn’t a true wide-angle, with an approximately 29-72mm focal length in full-frame equivalence. RF-S cameras are also able to take on RF lenses, so the Canon RF 15-30mm f/4.5-6.3 IS STM and Canon RF 16mm f/2.8 STM have offered slightly wider angles –equivalent to 24-48mm and 26mm respectively.