Carl Zeiss-Jena .965" orthocopics are among the very best oculars in terms of tack sharpness, freedom from noticeable aberrations and excellent light throughput. With only four elements and four glass to air surfaces, they have a distinct advantage in contrast over multi-element designs, and, Zeiss’s superb polishing of all glass elements achieved extremely smooth surfaces minimizing scatter in them to nearly undetectable levels. In my f/9 AP 180, these eyepieces produce tack sharp, contrasty views right to the very edge of their 40 degree fov. In faster scopes, like my f6 AP Traveler, their performance is equally high to about 90% of the edge of the field. For high magnification planetary work, for which they are particularly suited, they are sharper, have less scatter and greater contrast and produce cleaner whiter images of the planets and moon than do my Televue plossls or Radians or my Meade research grade orthos.
These oculars are not meant to be used with eyeglasses, but, they are parfocal to within a few millimeters, and eye relief is about the same or slightly longer than their focal length, so that, at like focal lengths, they are as good or better in this respect as well-reputed plossl designs like Televue’s. They are in excellent condition. All prices include well-packed, fully-insured Priority Mail Conus shipping, with tracking and delivery confirmation.
6mm $190 <SOLD>
10mm $200 <SALE PENDING>
12.5mm $200 <SALE PENDING>
NB. The 16mm originally had a plastic reticle insert which is not there now, but you wouldn’t use the reticle for observing anyway. With no field stop, the ocular’s usable fov is a bit wider than the “normal” 40 degrees, which makes it all the more desirable. You may wish to add a little flocking to the inside of the tube since it wasn’t blackened due to the reticle insert being there originally.