Over the rainy weekend I cruised through some of the Forum's lens reviews, noticed a single review of the K28/2 and remembered that I actually own one of these geezers. I bought it in 1981 (long after the K series had been replaced by the M lenses) from St. Louis Photo Supply (which located a demonstrator from a Pentax rep) for around 60-80 bucks if memory serves. Here are some sample shots I grabbed around the house this PM. Frankly, at f/2, it looks pretty soft - but these were handheld (by a semi-old man) and - of course - manually focused through the dim viewfinder of a modern, AF SLR. The others, shot at f/8, look OK. I thought some of ya'll might be interested.
Jer
shot at f/2
shot at f/2
shot at f/8
shot at f/8