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All ETX telescopes include an internal, flat mirror to reflect light to the telescope’s 90-degree
astronomical observing position; in this position the telescope’s image is right side up, but
reversed. For terrestrial observing, the #933 45-degree erecting prism reorients the image to
produce a natural view. In addition, it provides a convenient, 45-degree observing angle.
If you plan to use your Meade ETX 70/80 telescope for terrestial viewing, the #933 Erecting Prism
is a must-have.
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