https://www.dpreview.com/news/3872421874/canon-issues-advisory-for-new-super-telephoto-lenses-promises-impending-firmware-fix
ND
flipped into DEPTH OF FIELD
https://www.dpreview.com/news/3872421874/canon-issues-advisory-for-new-super-telephoto-lenses-promises-impending-firmware-fix