I just picked up a 6" f5.6 Dallon Tele-Anastigmat, which came in a box lot. I can't find out any info on it, like what type of lens it is, or how it is used. It has a black barrel with a silver adapter that is removable, and bit too big too fit a leica thread. There is no focusing ring on it, so is it for a view camera. Any ideas or knowledge out there.
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