Not long ago I practically gave away a 19.75" Eastman Anastigmat on Ebay. It covered 20x24. (admittedly, not the best at the edges, but still...) It wasn't one of THE lenses, so nobody seemed to care. The Fuji 600 C is as good as it gets and as new lenses go, it isn't THAT expensive if you want to shoot "big". My experience with single cells of shorter convertibles hasn't been that rewarding.(some cover, but with BAD edges) I tried a 600 Apo Ronar once, and wasn't satisfied with the edge performance near infinity(IIRC), but I had an 800 Apo Ronar, it covered fine and was one of the sharpest lenses I've ever owned, but at f/9 it weighed 8 pounds.
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