Up for sale is my Leica N PLAN 20X/0.40 microscope Lens model 506096. This lens will fit models such as the Leica DMLB, DMLS, DM750, DM1000, DM2000, DM3000, & More. I personally had it on my DM4000B and it worked great!! I'm sure the new owner will be very happy with it.