Canon's RF 600mm f/11 IS STM and RF 800mm f/11 IS STM lenses are some of the most interesting optics to come along in quite some time, and despite some photographers initially questioning them, as reviews have started to come out, it seems Canon has a couple of winners on their hands. In a recent interview, Canon indicated that the company may release more such lenses.
The Canon RF 600mm f/11 IS STM and RF 800mm f/11 IS STM lenses are quite unique, and despite their strange designs, they seem to be gaining a lot of good press. In a recent interview with Mynavi News, Kengo Iezuka discussed their creation and the future of such designs. Of note, he mentioned that these lenses were only possible with the new RF mount due to their very narrow maximum apertures (making it exciting to see what other unique lenses might be in store). More interestingly, Iezuka indicated that a 400 f/8 STM is also a possibility. Canon already has f/2.8, f/4, and f/5.6 lenses at the 400mm focal length (though the f/5.6 version has been discontinued), so a compact and affordable f/8 lens with similarly good performance as the 600mm f/11 and 800mm f/11 would certainly be interesting. Check out the full interview at Mynavi News.