1. I am selling my Konica Hexanon 55mm f/3.5 Macro lens. It is in excellent (used) condition, with clean glass and snappy aperture blades. On its own it is a sharp short telephoto, and with the included Macro Adapter it achieves 1:1 macro magnification. Also includes front and rear lens caps and the original Konica padded leather case.
The adapter actually has a neat function when it is coupled to the aperture tab on the lens - it maintains a constant effective aperture (opening the iris slightly and increasing the amount of light available) as you zoom in to maximum magnification. The lens body has 2 aperture scales on either side, when mounted on the Macro Adapter you see the actual effective speed using the second scale.
$90 shipped to Continental US, shipping elsewhere at your cost.
2. I also have a Konica Hexanon 2x teleconverter in great condition - can be used to achieve higher macro magnification but you lose about 1.5 stops of light. I can include it in with the macro lens for an additional $35 (total $125), or will sell separately for $40 shipped to ConUS.
Photos of the lens, and macro photos taken by me with this lens: