I do not understand why a short lens will not focus on a subject close up, when the bellows are extended??? I understand why it cannot focus at infinity. The focal distance is closer than you can compress the bellows but when you extend the bellows for closer subjects why will the lens not focus???
It does focus close up--around 3-6 feet the original poster says--but it doesn't focus on something 30 feet away, which is beyond the hyperfocal distance for a 65mm lens at f:5.6 on 4x5", i.e. "infinity."