Parks Parabolic Primary Mirrors (Pyrex) 16.25" f/4 Mirror-Webback
Parks parabolic primary mirrors are made of fine annealed Pyrex, with a full 1:6 ratio of thickness to diameter. Individually hand-figured by skilled opticians, each mirror will produce a good diffraction ring with no turned edges or edge zones. The optical surface will exhibit straight Ronchi bands from edge to edge as seen in the sensitive double-pass auto-collimation test. Aluminized and silicon monoxide overcoated for long-lasting performance.
Certificate of Optical Quality and Authenticity
It is hereby certified that this mirror has passed a series of critical optical precision tests and carries a full lifetime warranty from PARKS OPTICAL against manufacturing and material defects. PARKS OPTICAL further guarantees that this mirror:
Was manufactured from fine annealed, low-expansion Pyrex glass.
Is guaranteed to be diffraction-limited for superb visual and photographic images.
Passes the sensitive, double-pass autocollimation test with a 200 Line Ronchi Grating.
Passes the Foucault test for paraboloidal accuracy.
Will meet or surpass the Rayleigh Criterion of optical precision.
Was individually figured, tested, and serialized by Parks Optical.
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