Quality affordable mirror diagonal for refractors and cassegrain telescopes

The ProStar 90 degree 1.25-inch star diagonal is an affordable replacement or spare for your refractor or cassegrain telescope.Note: is not threaded for filters.

With 98% mirror reflectivity and optical coatings for performance longevity it prevails as excellent quality 1.25-inch star diagonal for optimal performance with any 1.25-inch ocular.