A couple of weeks ago, in response to a post about an apochromat enlarging lens, Tyler Monson linked to a picture of an apochromat of his own—a 4-inch Göerz Red-Dot Artar, c. 1960.
In passing, he threatened to find a way to mount it to a DSLR and actually take a picture with it.
As you can see, and as he documents in a recent blog post of his own, he succeeded—shown above is his steampunk lensmount, allowing focusing of the Göerz process lens all the way from infinity down to one foot.
And here's one of the pictures taken with the Artar, stopped down to ƒ/45. And you thought a 50mm Summicron on a G1 was out there?
(Thanks to Tyler)