Anyone know anything/ever use a Rodenstock Eurygon 300mm lens, f4.5 so quite fast? I read in my lens vade. Eurygon f4.5 300, 360, 420mm This was a plastic graduation portrait lens, using a triplet design. H&D gives 210-600mm, and confirms it is a triplet. Frerk confirms it is a triplet, and mentions small sizes for movie and macro work, possibly the f3.5 version, and large ones for general use. Coverage increases from 48° to 60° or to 70° as it is stopped down. It is suggested to use 21cm for 13x18cm.