At some point I am hoping to purchase a Petzval formula lens to shoot with my Graflex Super Graphic. I am still trying to figure out how to determine if the lenses I am looking at will cover the full 4x5. Since many of the folks selling these types of lenses on eBay rarely list focus distances, is there a formula you can follow based on lens measurements? or even on focus distance for that matter? Any help would be greatly appreciated. Thanks!
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