I would welcome informed comment from Richard and others about a Graflex 20cm f5.6 Optar which is on eBay in a 2x3 Century Graphic alloy board. Is this better than say a 180cm f5.6 Tele Arton or an Ektar f7.7 203mm on an extended mount? I don't suppose it will fetch a high price if it only covers 2x3. I do like these old American lenses, which are quite rare here. Thanks for your time Philip