I have a 150mm Apo Rodagon-N lens that is much larger than a regular enlarging lens and has no adjustable aperture. I am wondering if with Waterhouse stops this could be used as a 4x5 enlarging lens? Also I am curious what it might have been originally designed for—process lens of some sort? I unfortunately can't post a photo at the moment as my digital camera is not feeling well. The lens has a 75mm diameter front element and about a 72mm mounting thread. The overall length is about 96mm. Any ideas????