This 1.25" Astro-Tech broadband light pollution filter provides visual performance comparable to the best-known filters, but at only a fraction the price . . .
If this Astro-Tech AT80EDTA was just another feature-laden binoviewer-ready 80mm doublet apo refractor, it would be fairly priced. But – this is not a doublet. It has a genuine ED triplet lens system that Sky & Telescope said has “essentially textbook-perfect diffraction images,” and that makes it an astronomical bargain indeed . . .
