This 1 1/4", 90 degree erecting prism is the same as used on our top rated Stellarvue finder scopes. This is a correct image erecting prism. The helical focuser has a rubber grip and provides about .6" of travel. Many purchase these to be able to do fine focusing adjustments on telescopes that suffer from image shift when also needing an image that is right side up and correctly oriented.
The erecting prism is fully multi-coated providing extremely high light transmission (greater than 99%). Compared to prisms using Mgfl2 coatings, the contrast is much higher and the stars appear brighter. The clear aperture of the prism is 19 mm.
Side plates are carbon fiber. The insert tube is threaded for filters. Plastic dust caps are provided.
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Flawless design! Wonderful optics! Beats the competition that’s $25-$60 more.
Stellarvue spells QUALITY
Great diagonal. Sharp and clear images.
90-degree Erecting Prism w/Focuser (D1027A)
Wow, this is a beautiful piece of hardware with an attractive design. It has all the functional bits you could want and quality built. The image is bright and clear with no noticeable distortion or chromatic aberration. It will be a joy to use it for star observations that match the alignments seen on SkySafari or other sky map applications.