ED APO FCD1 Series
Apochromatic (ED APO) lenses are designed to bring all the colors into focus in the same plane where as Achromatic lenses are corrected to bring two wavelengths into focus in the same plane.
FCD-1 is manufactured by Hoya in Japan. This glass is used in the FCD-1 ED Essential and Carbon Fiber Series Apochromatic high-performance refractors.
Chromatic aberration is the phenomenon of different colors focusing at different distances from a lens. Telescope objective lenses for wide-band digital imaging in astronomy must have apochromatic correction, as the optical sensitivity of typical CCD imaging arrays can extend from the ultraviolet through the visible spectrum and into the near infrared wavelength range. Apochromatic designs require optical glasses with special dispersive properties to achieve three color crossings. Explore Scientific achieves this using costly ED (Extra-Low Dispersion) glass.
Description Temporarily Out of Stock, But More are On The Way! Explore Scientific ED80 Essential Series Air-Spaced Triplet Refractor is Available ...View full details$ 899.99Sold out
Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope - ES-ED10207-02Explore Scientific
Description The Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope is a true apochromat refractor that reveal...View full details$ 1,199.99Sold out
Description The Original Classic Explore Scientific ED127 Air-Spaced Triplet, Retooled for the Astrophotographer: New precision front cell wit...View full details$ 1,999.99Sold out