When I first got the scope everything was stuck and dirty, the biggest problem being the fine adjustment. It clearly has seen some abuse during its life. There's some paint damage as well.
Anyhow: I cleaned and greased the scope and now find it quite usable for such an old and neglected microscope. The mirror has some damage, the tube is oxidised and the glass has some spots but gives usable images, at least for me. Mechanical the scope is sound and the fine adjustment (a revolution equals 50 microns) works a treat now.
Last weekend I found another Nedoptifa (which is a kind of special because there aren't masses of these around) and had a few surprises since. This last find has a fourfold turret and two normal (8x and 40x) and two phase contrast objectives (40x and 90x, most likely oil?). There also is a polarizing setup with a filter under the condensor (filter delaminated) and a filter in the tube, which can be flipped on or off. This scope is in much better condition and has an adjustable condensor as opposed to the basic S.
Come to speak of it:Would it be possible to repair a delaminated polarizing filter? Of course I could get a simple plastic filter as a replacement but I like to keep it original and working
.... Peter