There are not much choices in Pentaxland for telephoto to super-telephoto lenses. In fact, the starting focal for that is at least 300mm IMO, even if we are to use the lenses on the Pentax DSLRs all of which are with a crop factor of 1.5X. To choose a fixed prime for 300mm that supports AF, Pentaxians have only 3 choices over years up till now, since Pentax launched their "new" AFSLR system in
