I find it interesting that there are former ammo factories in, say, Belarus, which have been converted into plants for making photographic lenses.
The lenses are cheap and of decent quality (most of the time), and perfect for a good-enough-ian such as myself.
I don't have any of these things, but here's a review of the Peleng 8mm/3.5 fisheye lens. I'm interested in this lens because it's a relatively cheap way to get into immersive QTVR without taking a zillion overlapping pictures.
Also many links from that page to other articles about this lens specifically, and the Russian lens phenomenon in general.