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GSO's 90-deg mirror diagonal is a very good, economical replacement for the generic diagonal that probably came with your otherwise fine scope. Features Al SiO2 coatings with 92% reflectivity across the visible spectrum and a 1/10 wave mirror.The clear aperture is 27.9mm. The main mirror housing is ...

If you want a high end mirror star diagonal for your Schmidt Cassegrain telescope, this Astronz/GSO 2" Quartz Dielectric Diagonal Mirrors is your best choice. Quartz mirrors offers greater thermal stability, resulting in minimal thermal expansion & contraction.The feature of Quartz diagonal are:- Op...

Mirror Diagonal 2" Quartz 99% DielectricIf you want a high end mirror star diagonal, this Astronz/GSO 2" Quartz Dielectric Diagonal Mirrors is your best choice. Quartz mirrors offers greater thermal stability, resulting in minimal thermal expansion & contraction.The feature of Quartz diagonal are:- ...