An ample 127mm or 5 inches of aperture … With the Explore Scientific FCD100 127mm refractor, you'll open a universe of wonder. I … I have a friend that images with both the aluminum 127mm essential series and an aluminum 80mm FCD100. I almost bought the carbon fiber version for AP, but wanted a faster focal ratio. EXPLORE SCIENTIFIC ED APO 127MM OTA EXPLORE SCIENTIFIC ED APO 127MM F/7.5 FCD 100 Series Air Spaced Triplet: 165000 + 18% GST ... Offering true diffraction-limited optics and a lightweight yet sturdy carbon fiber optical tube assembly, this high-quality telescope … Explore Scientific 127mm FCD100 Carbon Fiber Apochromatic Refractor. Buy Explore Scientific FCD100 Series ED127mm f/7.5 Apo Triplet Carbon Fiber Telescope (OTA only) featuring 127mm Aperture Refractor OTA, 952mm Focal Length, f/7.5 Focal Ratio, Hoya FCD100 Anomalous ED Glass, Apochromatic Triplet Lens System, Proprietary EMD Enhanced Multi-Coatings, Vixen-Style Dovetail Plate, Lightweight Carbon Fiber …