Long story. I bought a pm5 from someone, and it seems that it comes with a highly corrected diopter lens. Of course, I did not check carefully at the time when I was buying, thinking that the guy will certainly tell me if there is something not normal/original. Since my eye sight is normal, everything appears in the viewfinder is blurry.
If you have a spare normal (I think -1) diopter lens that you are willing to sell, please pm me. Thanks