Quote:
Originally Posted by drshr
What are the coatings?
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From Bintel's website: "Bintel’s RCA series feature precision figured hyperbolic primary and secondary mirrors. As it contains no refractive optics there is no chromatic aberration at all – none.
Primary and secondary mirrors are low thermal expansion quartz substrate with durable, high reflectivity dielectric coatings (>99% reflectivity across the entire visual spectrum)."