It was nice to reread this thread and refresh my memory on the specs of the 180mm Apo Rodagon that I still have. 2x to 6x optimum range . . . that's ideal for a 4x5 enlarging lens. A 150mm enlarging lens is nice, because it's a little longer than what's needed in an enlarging lens. The 180mm enlarging lens carries that a step further.
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