The product is intended for cine lenses. Cine lenses and photo lenses use the same filter threading, so as long as the diameter is right it should fit. Optics manufacturers are good that way, for example I use a Sensei 52-48mm step down ring on the front threads of my Canon 10x42L binoculars to mount standard 2" telescope eyepiece filters and they thread on just fine.
The reason it's difficult to find more info on Century Precision Optics is that Schneider Optics (parent company of B+W filters)
bought them a long time ago and basically absorbed them. You could try
contacting Schneider and ask them to confirm that the diopter you want has standard lens filter threading. I'm pretty sure it does, but $500 is a lot of cash to throw away and asking the question is free.
