Through some optical slight of hand, this eyepiece provides the largest field of view possible with a 1.25" eyepiece. This is a five element design which was later emulated in the Takahashi LE series and the Celestron Ultima series (and clones). Superb Japanese craftsmanship and coatings, excellent condition. I hate to part with this one, but it requires a shorter optical path than I can achieve in my FC-76 with a 1.25" diagonal. It comes with box but no caps, just like when it was new.
$135 plus ship/insure SOLD to Chuck