Originally posted by bluestringer Yes. Either the Pentax-M 100mm f4 macro or the M- 50mm f4 macro. Both excellent lenses, and can be found fairly inexpensive.
+1.
Note, except for coatings, virtually all pentax macros between Super Tak 100/4 and the A 100/4 are optically identical
There are just a lot more of the M lenses around.
One other thing you might look for as well is a vivitar macro focusing teleconverters. It is a bit of a unique thing, as it has a focusing helix combined with a TC, and when used with a 50mm lens gives you 1:1 macro. They can usually be had for about $50 for K mount, KA mount with lens contacts are rarer and cost more but let you have automatic functions