Farpoint Dew Shield - Meade ETX 90 SCTThe Farpoint FP342 is a precision sized flexible dew shield for the Meade ETX 90, Celestron NexStar SLT 90 Maksutov, and similarly sized small Maksutov and APO telescopes. It slips over the front of your OTA in seconds, slows radiative heat loss from the front optic, and keeps dew off your meniscus or lens through the night. Fits These Telescopes Tube outer diameter: 3. 85 to 4. 33 (98110 mm) Maksutov Cassegrain: Meade ETX 90, Celestron NexStar SLT 90