Like the FS series, the FC series telescopes are apochromatic refractors with two-element fluorite lenses.The FC series have larger apertures and longer focal lengths than the FS series and provide outstanding performance both for the visual observer and the digital imager. The FC series has its own dedicated set of reducers and flatteners and is also able to use some of the accessories from the TOA series.
The two telescopes in the FC-76D series consist of an apochromatic fluorite doublet with
a 7bmm objective diameter. Both telescopes are 540 mm f/7.5 instruments. The front element uses an eco-glass for maximum light transmission, with a coated fluorite rear element for superb color correction.
The FC-100D series consists of an apochromatic fluorite Steinheil doublet with a 100 mm objective diameter. Both telescopes in the series are 740mm f/7.4 instruments, The front element uses an eco-glass for maximum light transmission, with a coated fluorite rear element for superb color correction.