Cosina 100mm f3.5 macro bargain
I recently picked up a Cosina 100mm f3.5 macro lens for £15.00 on eBay. These are a couple of shots with it, hand held (in one hand), using a Yongnuo flash gun in slave mode 2 in the other hand, triggered from the built in flash, on the K20D.
I'm also having fun using it for extreme close-ups (500mm super macro equivalent) on the Q.
I find it interesting that the EXIF data records the lens as smc PENTAX-FA MACRO 100mm F3.5.
As others have stated on here, the lens is pretty plasticky and the autofocus is clunky, but I find it easier to use MF, set it to the minimum focus distance and move the camera in and out.