William Optics 2" 90° Dura Bright Dielectric Diagonal 2" dielectric mirror diagonal with 99% reflectivity for refractors and catadioptric telescopes. Ideal for wide-angle visual observation.
William Optics 2" Dura-Bright 99% Diagonal for SCT (Carbon Fiber) 2" 99% dielectric mirror diagonal with carbon fiber panels and SCT thread. Designed for direct fit on Schmidt-Cassegrain telescopes.
William Optics 1.25" 90° Erecting Prism with Helical Focuser William Optics 90° erecting prism for 1.25" eyepieces with filter thread and helical focuser. Ideal for terrestrial viewing.
William Optics 1.25" Dura-Bright Dielectric Diagonal (Carbon Fiber) Premium 1.25" diagonal with 99% dielectric mirror, carbon fiber sides, and 1.25" filter thread. High contrast and sharpness.