The 240mm Tele Arton doesn't cover 7x5 it covers 5x4 with room for movements though. As a 210mm f4.5 Tessar will cover 7x5 with reasonable room for movements then any 240mm Tessar type lens will cover well, the closest CZJ Tessar was a 250mm f4.5.
My main 7x5 standard lenses are a 1919 CZJ 21cm f4.5 Tessar in a Compound or a 240mm f5.6 Nikon W in a Copal 3, the Nikon lens is larger and heavier but not unwieldy it has the advantage of being a moderate wide angle on my 10x8 cameras as well.
Ian
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