I’m surprised there isn’t more discussion about the Sea and Sea corrector lens. I have one for the EF 17-40L and corner sharpness was noticeably improved. Not WACP wow but better IMO. They only make two sizes, maybe too big for RF lenses?
Hi, I’m Jeff Laity. I’ve been shooting underwater for around 20 years. I won the Kona Classic Best of Show in 2005 and a few other small awards. I was a member of the Los Angeles Underwater Photography Society when that was active. I mostly shoot off the coast of Southern California and the Channel Islands but occasionally make it to the Indo Pacific and other dive hot and cold spots.