Meade 07210 45 Degree Erecting Prism #932

#932 45° Erecting Prism: If the ETX-90EC is to be used for extensive terrestrial applications, the #932 45° Erecting Prism is a useful accessory. Images through the 90° eyepiece-holder appear right-side-up, but reversed left-for-right. The #932 Prism threads on to the telescope's photo port and presents a correctly oriented image as well as a convenient 45° observing angle. An eyepiece of any focal length (magnifying power) may be inserted into the #932 Prism. Note that the flip-mirror control must be in the "down" position for use with the #932 Prism.

Reader Reviews
This 45 degree erecting prism is great for birding or terrestrial viewing but is not suitable for star gazing (imagine if the star is right above your head). For star gazing the prism does not reflect as much light as desired so you won't be able to see dim distant objects easily, for that I recommend star diagonal with everbrite mirror ( from televue), it will cost more but a good investment for anyone who is serious about star gazing.