I ordered a 165 mm lens for my Pentax 6x7 from KEH and they were kind enough to send me a 45mm wide angle in a bag marked 165mm. I shall keep it, since they think they did the right thing and so do I. I expect it is a very good lens. I have the 55mm, which unfortunately uses those pesky 100mm unfindable filters. The 45mm uses 82mm filters, which I have bunch of. Good lens? Hope so. Any advice?