Douglas,
those macro pics just look so good. I never knew why those Hexanons would disappear into oblivion.
Interesting story about their AF-mount going into Sigma's pipeline.
Here's two more from the hacker's delight,

A heavy crop from a Praktica-B-mount 80/1.8 Pancolar on K100D stopped down (fireworks, no aliens involved :-).
The same lens exists in M42, so no real reason to hack it other than compulsary hacking .-)

Y/C mount Yashica ML 1.4/50 on K100D @f/1.4- I did the bayonet hack so no hack of the lens really. Y/C mount will have infinity sometimes and sometimes not - better test it before or know if you can adjust inf. on the lens.
Best, Georg (the other)