http://www.bdimitrov.de/kmp/lenses/zooms/medium/K45-125f4.html
Saw 1 or 2 not long ago on eBay, but the prices weren't high as I remember. Not very popular for sure, don't know if they are rare.
Alan Chan http://www.pbase.com/wlachan
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4688&item=3845290789&; rd=1
I never saw a SMC Pentax 4.0/45-125mm lens before.
