Uses a moveable 3" field lens to achieve f/4 f/5 or f/6 from
your C11 or C14. Extremely flat field, fully illuminates the
widest 2" eyepieces unlike screw on SCT reducers which don't
come close. The best tool around for astroimaging and CCD
with your C11/14 SCT. And great for visual use too. No vignetting,
no field effects. Mint condition. Accepts Lumicon off axis guider
attachment. $200 plus shipping. Pictured on C11 OTA. OTA and
Diagonal / Eyepiece not included.