Thanks, Donald.
I have been using a broken shutter 13.5 cm lens, which I feel was the original lens, wide open, with the camera shutter, I like the images I've gotten, plus I have a pair of Polaroid press lenses, a 7.5 and 12.7cm lenses in like new Prontor shutters, and I have a large Kodak Lens, that needs cleaning, and evaluation as some of the balsam appears to be separated, between the elements.
I also have a Wollensak barrel lens that might be from a copier, but I've no mounted that on a board.
Slowing down enough to work out the focal plain shutter combinations, is simple enough, back when I shot some models in the same lighting, multiple times, but on the fly, I get distracted too often and would prefer using a proper shuttered lens combination.
The 7.5cm Prontor set-up is, like the 12.7 cm, in the original box, in great condition, and I guess I should go ahead and sell or trade it for something else.
After I finish finding Filters on my list, finding one of those cheap lenses and shutters, should be my next endeavor.
Cheers.