Ralph - while they may in fact be optically excellent, they are valueless in today's economy. They're from a second-tier (at best) manufacturer, they're early zooms from a time when zooms were not as good as primes, and they're in a relatively exotic mount. So the market for them is somewhere between very small and non-existent. They may in fact be useable, and may in fact produce good images. But they add about $0 to the market value of the kit, if not subtract from it.