Before the upcoming Pentax DA 560/5.6 comes and if you really need one, here is already an alternative option, i.e., the Samyang/Walimex 650-1300/8-16 telescope:-http://www.mediaresort.de/shop/en/Lenses/for-Pentax-Samsung/walimex-pro-650-1300-8-16-Tele-for-Pentax-Samsung.htmlThe "lens" can be mounted onto a K-mount body via an T to K adaptor. It is sold at 299 Euro or a bit more than 300 US$.
