When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Canon has done a great job of filling out the supertelephoto options for the RF mount, but there is one glaring omission in the line-up thus far, and that’s an RF version of the EF 500mm f/4L IS … Continue reading Will the EF 500mm f/4L IS USM II replacement for the RF mount be a zoom?