I have the 150mm version on my 5x7 as jlp said it's reasonable sharp and offers plenty of movement. The coverage is probably the same as the Berthiot perigraphe. Unfortunately the name Hugo Meyer is held in low esteem because of it's GDR future but the pre war lenses are second to none in my opinion. And even some of the GDR lenses aren't bad. The Plasmat was a Paul Rudolph for Hugo Meyer design after all.