The Canon RF 100-500mm f/4.5-7.1L IS USM is the first super-telephoto zoom lens for EOS R-system mirrorless cameras. It goes without saying this is a high-quality lens with its L-series build, and even has a heat shield coating for coping with shooting in challenging weather conditions, whether it’s hot or cold. I bought an R with the RF 24-105 L about 3 years ago, and I added the 24-105 RF STM a year ago for ease of carrying. The RF L lens is clearly the best, as it should be, given the price. But there's very little in it between the STM and the EF L - optical performance is remarkably similar - weakest at 24mm, otherwise pretty decent. .

canon rf 24 105 f4 l review