Fujifilm X100 brand_Polaroid Nikon focusing screen for F4

Nikon focusing screen for F4 camera bodies

but it's not compatible with any Sony mirrorless lenses- that's a different mount

which does not affect function

That's a weird thing to say

clean optics and good function

Fujifilm X100 brand_Polaroid Nikon focusing screen for F4The Fujifilm X100 is a high quality compact digital camera with a fixed Fujinon 23mm f2 lens, 12mp sensor, tactile dial based controls, and a very nice hybrid optical electronic viewfinder. Original firmware versions were a bit sluggish in use, but this camera's updated firmware provides pretty solid autofocus performance and much improved manual focus. In excellent condition, with only minor cosmetic wear from light use. Clean lens, excellent image