Any long macro option?

I'm currently having a Tamron AD2 macro with AD2 2x teleconverter to make it 180mm. Do you guys know of any long macro lens on / can be adapted to Pentax mount? I'm looking for something 135mm or longer.
Bugs hate me. They run away everytime I am near. >_

See my post in your other thread on the same subject.

Sigma DG-EX 180mm 1:3.5 is your answer, if you can find one.

if you want the best there is a Pentax 200mm macro...