The 12" Parabolic Mirror Set from JMI Telescopes is a primary and secondary mirror set for do-it-yourself telescope projects. Both elements have been precisely designed and engineered to meet exacting specifications at the Guan Sheng Optical factory. The primary and secondary mirrors are constructed of diffraction limited BK7 glass and feature an aluminum reflective coating and a SiO2 protective coating.
BK7 is a barium borosilicate optical glass known for its high transmission and clean, clear appearance.
Primary / Secondary Set
This mirror set includes a 12" primary mirror and 70mm secondary mirror, delivering a 1500mm focal length and f/5 light gathering ability.
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Primary: 12" / 305 mm (nominal); 11.97" / 304 mm (actual)
Secondary: 2.75" / 70 mm
35 mm (primary)
Primary: 14.3 lb (6.5 kg); Secondary: 5.6 oz (159 g)