I think that the approach of using these lenses with 35mm cameras, digital or film, via adapters or improvised shutters, with possibly ND filters used as a misdirected substitute for aperture control (doesn't really do that, for the depth of field would not change just because the ND filter is in place) is wrong-headed.
I believe that the best use of these lenses is with alternative media cameras that have a very low ISO equivalency, that is, require long exposures, and even when used in the field are on medium format or large format cameras, possibly of the user's own construction. With the very long exposure time for some of the obsolete, now home-crafted media, one can use a shutter as primitive as the old movie house dowsers, basically a gate that securely shuts of light to the lens or from the lens.
I have two such lenses. They appear to be internally very clean, with lens faces in fine condition, although both were filthy with accumulated dust, due to my brother's careless storage conditions. Wish I knew where he got them... perhaps from Berkeley, CA camera club decades ago? Both are made by the same Japanese company, but do not identify the manufacturer. I have offered one on eBay, but may not renew my listing, for I think I might dismantle it and insert a fixed aperture ring to give it some depth of field. Both are 150mm, are identical with greater than 120mm front lens element, and, if I recall correctly, greater than 90mm rear element. They are also labeled 9X. I was considering that they possibly could be used in IR realm, for they seem to lack conventional coatings.
I saw one of these listed on the Web a couple of years ago, and not for sale. The listing was old and I didn't pursue the question of what to do with it. I'd reiterate that these are not really good candidates for the 35mm camera, unless you want to use it in a studio setup for special purposes. I think you'd need at least a doublet correction lens in an adapter tube to get your image to your 35mm camera's image plane. If you're bound and determined to mount this to a 35mm camera, consider setting up a makeshift lens bench and measuring your distance from rear lens element to image plane. Use a low wattage filament lamp, such as those 2W to 5W decorative clear (unfrosted) lamps, perhaps a clear candelabra lamp as your object. Project onto a white card. Measure the distance. Perhaps you recall doing something like that in high school physics class or middle school general science class?
If you have one of these, or seek one of these for your entertainment, be prepared to do more work than merely attaching an F-mount, K-mount, or whatever camera mount adapter you think you need for your camera... it'll take some measuring and planning.