Olympus MCON-P01 - element made of plastic?

Thanks so much for this tip.

I bought the MCON-P01 for the 40-150 since I don't have a 14-42 II. I didn't work fine for me so it was collecting dust. Recently I bought a 45mm (and love it). Just tried the MCON-P01 on the 45mm in bad lighting and it works fast enough and got great results (for not a real macro lens).