TeleVue star diagonals are of high-quality workmanship and are a valuable addition to any astronomer's kit. One should never stint on accessories - even the finest telescope can give poor results when used with a low quality prism.
TeleVue offers a variety of mirror and Amici prism star diagonals designed to avoid causing any optical 'bottleneck' in the overall optical system. You still get the quality of telescope optics, from the objective lens to the eyepiece - without any noticeable loss.
The DSC-8001 is a 2'' - 90° zenith mirror with 96% reflective aluminium coating. Each housing is milled from a solid block of aluminium and undergoes strict quality control.