Tele Vue NP101is Accessory PackageThis package includes everything you need to start observing with the Tele Vue NP101is telescope: 4 clamshell style Ring Mount with mounting threads to attach to a heavy duty tripod or telescope mount. 2 90 Everbrite Diagonal (99% reflection across visual spectrum) with 2 to 1 adapter. 18. 2 mm DeLite eyepiece, with 20 mm eye relief, yields 2 true field of view at 30x in this scope.