BAVEYES Pentax 67 - GFX 0.62x Focal Reducer Mount Adapter with Macro Helicoid This item was just released, and I don't think you'll find many used ones yet. I bought it in August of this year, so it's very clean and almost like new. The purchase price was about 240,000 yen + customs duties. This adapter allows you to use Pentax 67 lenses at almost their original focal length. There is some distortion at the edges, but it was easily corrected. It's designed with the 105mm lens in mind, so the 105mm lens had very little distortion. Personally, I was most impressed when using the 90mm lens. It looks great and was very satisfying, but I'm selling it because I'm changing systems. No claims and no returns, please.