OTA · 1990–1999 Vixen FL-70S Vixen Optics · FL-70S Key specifications Aperture70 mm Focal length560 mm Focal ratiof/8 Optical designFluorite Doublet Weight2.3 kg About 70mm f/8 fluorite (CaF2) Steinheil doublet apochromatic refractor from the classic FL series.
