Posted by Dr. Timo Mappes on January 28, 2008 at 21:04:11:
In Reply to: Re: Carl Zeiss Jena K.20X microscope eyepiece
Dear Bill, "K" is for "Kompensationsokular", this is a compensating eyepiece designed for the use with apochromatic objectives. Your eyepiece has a focal lenght of 12.5 mm and a magnification of 20 times. All the best, Timo