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 The ED80 Essential Series Air-Spaced Triplet Refractor is a true apochromat that reveals celestial wonders like the desolate beauty of...View full details$ 849.99Sold out
Original Price $ 1,199.99Current Price $ 899.99
Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope - ES-ED10207-01Explore Scientific
Description The Explore Scientific ED102 Essential Series Air-Spaced Triplet APO Refractor Telescope is a true apochromat refractor that reveals o...View full detailsOriginal Price $ 1,199.99Current Price $ 899.99Save 25%
Original Price $ 1,899.99Current Price $ 1,449.99
Description Great for astrophotography and critical visual observations, the Explore Scientific ED127 Essential Series Air-Spaced Triplet Refracto...View full detailsOriginal Price $ 1,899.99Current Price $ 1,449.99Save 24%
Description Observing with the ED152 Air-Spaced Triplet FCD1 Series Apochromatic Refractor in Carbon Fiber with genuine HOYA FCD1 ED Glass: Seriou...View full details$ 4,499.99