erecting prism

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Noun1.erecting prism - a right-angled optical prism used to turn an inverted image upright
optical prism, prism - optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
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3 Finder Red dot 8 x 21 Star diagonal Right angle Erecting prism Mount type Fork (3) German equatorial Computerized "Go To" Yes No Motorized tracking Yes Optional Supplied eyepiece(s) 20 mm (60x) 17 mm (71x) 4 mm (300x) (8) 10 mm (120x) Manufacturer Meade Meade Orion Model ETX-90AT ETX-90PE StarMax 90 EQ US price (1) $595 $695 $289 Focal ratio f/13.
4) Price includes 1 1/4-inch erecting prism and 20-mm eyepiece.