A modified binocular eyepiece converted to a 1 1/4" eyepiece.
18mm eye relief
built in roof prism produces correct left to right, and upright images.
requires an extra 1" of infocus as compared to a no prism eyepiece.
it can be used on telescopes that don't have much infocus.
$59 plus $5 shipping in the ConUs
See photo below.