John also has another excellent point. What accessories/lenses do you plan to use? The Accura units were "clones" of the Kilarflex/Kilarscope which have 78.8 mm registration. So Kilfitt lenses are obvious choices. But its adapters are hard to find. I know of only three lenses that mount directly - the 90mm Kilar, some 135mm Kilars, and a rare 135mm f3.8 Sun. The other Kilfitt basic lenses require a REZWI adapter, essentially a 14.5mm extension tube. Kilfitt (later Zoomar) AN and WE lenses require rare adapters. There are lots of bellows, particularly Accura bellows/Kopil and Kilfitt bellows, that can be found readily and cheaply.