Referring to an https://www.youtube.com/watch?v=3jzd2_EHwo8 10:02ffinterview with a lens expert (Krolop&Gerst Objektivreihe 17/32), an interview with a lens expert, discussing diffraction limits.
"Es gibt ein paar Spezialobjektive die haben ein bisschen anderes Beugungsverhalten, aber da möcht ich echt nicht drauf eingehen, also dass ist Grossformatfotografie aus den achtziger Jahren"
"There are a few special lenses which have a slightly different diffraction behaviour, but I do not want to go further into this, since that is specific to large format photography from the 1980s."
What is the expert referring to here?