When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. One of the niche, yet loved lenses from the EF mount era is going to get the RF treatment with an all new design in 2024. That lens will be the Canon RF 400mm f/4 DO IS USM. … Continue reading Canon will bring an RF 400mm f/4 DO IS USM to the lineup in 2024