Canon RF 24-105mm f/4L IS USM. The Canon EOS R was bundled with this lens at launch, but that 'kit lens' designation belies how good this optic really is. The first zoom, and the first stabilized lens, for the RF mount, it's a great all-round performer. Is the Canon RF 24-105mm f4 L worth it for photography? Should you buy this lens? This is review of the Canon RF 24-105mm f4 L lens for photographers.Canon R The RF 24-105mm f/2.8 weighs nearly twice as much as the RF 24-105mm f/4 L IS USM lens, which tips the scales at 1.5 pounds (700g). The Canon RF 24-105mm f/2.8 L IS USM Z is also the first Ho3AR.