I was hoping to salvage something out of the pathetic E 16/2.8. I opened it up.
The mount, though metal, is aluminum (all other E lenses appear to have a stainless steel mount).
Incredibly, they have used plastic shims to hold the rest of the plastic!
I had seen scotch tape holding together of cheap Nikon zooms but they still use brass shims to adjust and center the optics bit.
This something new.
I am unsure if the optics are real glass or plastic but everything appears to be molded together and disassembly without destruction is impossible.