"New" Lens

Ok, this is kinda two pictures put together. Mostly, it's a picture of a rather fine-pointed ball-point pen. In the corner is the lens I used. I just attached an old Mamiya 50mm f/2 of my dad's from the 60's to a small piece of metal tube i had lying around the house and a nikon body cap with a hole in it. As you can see, it focuses insanely close with almost no depth of field. Fun little super-macro lens, but I really should use it with a tripod in stead of stupidly trying to hand hold it.