i picked up the 'a' version of this sears lens... from a fellow pentaxian... for about 25 bucks...
PentaxForums.com Third-Party Pentax Lens Review Database - 135mm f2.8 Auto Multicoated.. and
http://www.pentaxforums.com/forums/p...-question.html
for a few bucks... it's worth a shot... (lol)....