My last and most expensive second hand Zuiko purchase was an 18mm f3.5 complete with original caps and the rare 49-72mm filter adapter, along with a B&W 72mm multicoated filter. I paid around $1,000 for it. Would never have paid that much for it, except the chance to get one in good condition (with pristine rear and bulging front elements) and with that filter adapter might not come around so easily again. Price was high, but not out of line for what this lens is going for these days.