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-100 is manufactured by Hoya in Japan. This glass is used in the FCD-100 ED Apochromatic high-performance astrograph refractors designed to take your astrophotography to the next level.
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.
ED APO FCD100 Series
Air-spaced triplet apochromats with genuine HOYA FCD100 extra-low dispersion glass, for high-contrast visual observing and astrophotography.
01
Travel & wide-field
80mm f/6 triplet with a 480mm focal length and a 2.5" HEX focuser. Compact and portable, with sharp, true-color views of the Moon, planets and deep sky.
02
Visual & imaging
102mm f/7 air-spaced triplet with FCD100 ED glass and EMD multi-layer coatings. Equally at home at the eyepiece or behind a camera.
03
Lighter tube
The same FCD100 triplet optics in a carbon fiber tube, with a heavy-duty 2.5" HEX focuser. Less weight on your mount, same razor-sharp images.
04
Serious aperture
127mm f/7.5 triplet APO for demanding visual observers and astrophotographers, with EMD coatings for high-contrast, color-free views.
05
Flagship
Our largest FCD100 triplet in carbon fiber, about 14 lb, with a 2.5" HEX focuser built to carry heavy imaging gear.
Flatteners, reducers and mount packages are on each telescope's page.
FCD100 ED APO Triplet Refractor Telescopes
