I have a Nikon binoviewer and 3 sets of eyepieces for sale.
The binoviewer is in very good condition and works great. It does require the use of a barlow(unless you have an extra 4 3/8" in travel on your focuser). This is a microscope conversion. IT does not require refocusing when you adjust the interpupilarly(I think thats spelled right)distance like most microscope conversion. Asking $300 shipped SOLD!!!!!!!!!