ProStar optics 90 degree Correcting Diagonal for comfortable astronomical viewing with refractors.

ProStar optics 90 degree Erecting Diagonal (1.25-inch)

If you have a conventional refracting telescope used for astronomy that produces an inverted image when looking at land subjects, this special prism diagonal will correct the view for normal terrestrial viewing.

ProStar 90 degree Erecting Diagonal 1.25-inch

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