One other factor you notice in vintage cameras. After time, certain focus ranges/points (the ones commonly used) tend to become loose or bumpy because of wear. I expect the best modern cameras (Sinar, Arca, etc.) have tracks and gears that wear only slightly with time and, hopefully, are replaceable. With our vintage cameras, we do "transplants" from donor materials. I can only say that something as ancient as a 4x5 Korona view camera can have excellent front and rear focus, allowing discrete movements and precise-to my eye-focusing. GO
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