Check the listing for details. Stop Down Mask External cap for Meade LX85 R5 120 Refractor 77mm hole w/ Plug. Condition: New. Listed at 15.99 USD. Enhance your stargazing experience with this Stop Down Mask External Cap for Meade LX85 R5 120 Refractor telescope. Crafted with high-quality plastic material and a 77mm hole, this mask is the perfect accessory for improving your telescope's performance. The cap comes with a plug and is compatible with Universal and Meade LX85 series, making it a versatile addition to your telescope accessories. Designed by Spencer-3D and expertly manufactured in the United States, this stop down mask is an essential tool for every stargazer. It helps in reducing the aperture of your telescope and improving the contrast and sharpness of the image. Easy to use and install, this mask is a must-have for anyone who wants to take their astronomy game to the next level.