Can't let go of that aging 35mm SLR accustomed to a strict film-only diet? Nikon seems to be toying with the idea of feeding its older models digits instead, judging by a Japanese patent application published last week. It was filed just last year and shows a digital back designed to be swapped out easily, complete with a screw adjustment to fine-tune the all-important focal distance. The patent was scoped by prolific Japanese blogger Egami, who pointed out that a different design
