Monty here on apug shoots an Ebony 20x24 and I think he is using the Fine Art 550 xxl on that format. Maybe Zebra will chime in. I think they are a dagor design but with much better optics and though the price is steep they do compare in price to a 24" dagor (if you can find a 24" dagor that is). I know William Corey just started using one and William is not one for changing lenses. The majority of his 8x20 work is created with an old 18" Kodak wide field copy lens. He is really pleased with the 550 although he says it seems a bit over engineered. But that's not surprising considering who is making it and the price. We're lucky in the fact that Schneider would even consider making such a lens with the size market it is directed at. Thus the price tag.