If you really want to play around, try a single lens, positive meniscus or planoconvex. Can be found at surplusshed for $4 - $10, use their 'lens finder'-function. Not for those who try to eliminate abberations though. Mount it in a homemade barrel with a stop right in front and voila; or put it in an old shutter.
They usually get kind of sharp in the middle, and by middle I mean just that. At the corners you just got blur. That goes for the short lenses anyway, and my own attempts I might add.
I've used two versions of single element lenses with some Rollei IR and an f.stop around 16 - 22.
N.b. some of the fast old aero lenses had a mildly radioactive element and will thus have yellowed by now.... making them effectively a good deal less fast than they once were.
You can use the old UV light soak trick to bring them back to clear I bet. I've had several of the old screw mount pentax lenses yellow on me, about 4 weeks in direct sunlight made them look like new again.
Now it is clear that I can only echo the comments by Polybun: My old Minolta lenses also have some mildly radioactive elements in their construction. Usually this makes them turn a light yellow in color as you look through the lens. A couple of weeks in direct sunlight or UV (ultra violet) light seems to restore them to normal.
Ralph Javins, Latte Land, Washington
When they ask you; "How many Mega Pixels you got in your camera?"
just tell them; "I use activated silver bromide crystals tor my image storage media."
I have a 135mm Rodenstock Eurynar that is a f/3.5. It is uncoated and I like the way it looks on film. I have never seen another one though since I bought it a few years ago. I picked it up on ebay attatched to a Welta 9x12 folder for $100.