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Telescopes contain internal mirrors that reflect light to the telescope's astronomical observing position. In this position, the
telescope's image is upright, but reversed left-to-right. This is of little consequence for astronomical viewing, but for
terrestrial observing it is highly desirable to have a correctly oriented image. The #928 Erecting Prism delivers a fully
corrected image and provides a convenient 45 observing angle for optimal terrestrial viewing.
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