A friend lent me an Industar-61 L/Z M42 Macro lens to try out, and I decided to give the K10D a little tour
I did not even notice the bug until I had a look at the images on my PC screen
it was just at the right spot by chance.
I'm very pleased with the Industar-61, it's not "true" macro, maybe 1:2, but very useful overall.
I also now have a M39 to M42 adapter, which allows me to use my "normal" Industar-61 50mm 2.8, though macro only, and no focus adjustment. Together with a 2x Teleconverter I can get about 1:1 true macro, but it's much more difficult to use.