No worries! But please slow down and read carefully. The listing at CatLabs says "(covers close to 8X10 at infinity)". The wording before that, about "standard, non-macro lens, with very large coverage", refers to smaller formats only. 210mm is the "standard" or "normal" focal length for 5x7.
This https://www.catlabs.info/product/rod...r-4x5-5x7-8x10 one? Vendors sometimes exaggerate coverage.
For a contrasting, perhaps more correct, view, see http://www.graflex.org/lenses/lens-spec.html and https://www.photo.net/discuss/thread...sironar.37076/
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