ED APO FCD100 Triplet Series

Explore Scientific Apochromatic (ED APO) lenses are designed to bring three widely separated wavelengths into focus in the same plane where as Achromatic lenses are corrected to bring two wavelengths into focus in the same plane. FCD-100 is manufactured by Hoya in Japan and has a lower refractive index than the FCD-1 used in the FCD1 series telescopes. This results in better color correction, contrast, and image sharpness at higher magnifications.

Apochromatic refractor light ray trace

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.

  • Explore Scientific 80mm FCD100
  • Explore Scientific 80mm FCD100

  • This 80 mm f/6 apochromatic refractor features an air-spaced triplet optical design with premium Hoya FCD100 optics that virtually eliminates chromatic aberration. read more...
  • Our price: $999.99

  • Explore Scientific 102mm FCD100 Apo Refractor
  • Explore Scientific 102mm FCD100 Apo Refractor

  • The Explore Scientific 102mm FCD100 is a 102-mm f/7 apochromatic refractor featuring an air-spaced triplet optical design. read more...
  • Our price: $1499.99

  • Explore Scientific 127mm FCD100 Apo Triplet
  • Explore Scientific 127mm FCD100 Apo Triplet

  • The Explore Scientific 127 mm f/7.5 apochromatic refractor features an air-spaced triplet optical design. read more...
  • Our price: $1999.99


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