Hauling an aluminum refractor tube to a dark site or up to a rooftop observatory adds weight that compounds with the mount, tripod, and accessories. The Explore Scientific ED102 FCD100 Carbon Fiber delivers apochromatic triplet performance with HOYA FCD100 glass in a carbon fiber tube that sheds weight, resists temperature-driven focus shifts, and looks the part — at a fraction of what comparable 4-inch carbon fiber APOs cost from competitors.

Key Features

• HOYA FCD100 Extra-Low Dispersion Glass – FPL-53 equivalent optics virtually eliminate false color, delivering sharp, true-to-life views of planets, double stars, and deep-sky targets in both visual and imaging use
• Air-Spaced Triplet Optical Design – Three-element configuration achieves 1.14 arcsecond resolution and diffraction-limited performance with high contrast across the field
• Carbon Fiber Tube Construction – Significantly lighter than aluminum alternatives and far more thermally stable, reducing focus shift during long-exposure imaging sessions and speeding up cool-down time at the observing site
• 2.5" Hexagonal Dual-Speed Focuser – Rock-solid rack-and-pinion design with 10:1 fine focus ratio supports up to 10 lbs of imaging gear with zero flex or image shift
• EMD Enhanced Multi-Layer Coatings – Proprietary broadband coatings maximize light transmission and contrast for faint deep-sky targets
• Versatile f/7 Focal Ratio – Long enough for high-magnification lunar and planetary detail, yet pairs well with a field flattener for sharp, flat-field deep-sky imaging
• Retractable Carbon Fiber Dew Shield – Blocks stray light and slows dew formation during extended sessions without adding bulk
• 99% Reflective 2" Diagonal Included – Premium dielectric diagonal maximizes light throughput right out of the box, so you can start observing without additional purchases

Ideal For

• Astrophotographers on mid-range mounts who want sharp, well-corrected optics that perform on a HEQ5, Celestron AVX, or similar payload — the 9.5 lb carbon fiber OTA leaves plenty of weight budget for cameras and guide scopes
• Visual observers stepping up from doublets looking for clean, color-free views of planetary detail, tight double stars, and crisp star clusters without the chromatic aberration that plagues two-element designs
• Grab-and-go astronomers who want serious apochromatic performance in a compact, lightweight package that sets up quickly and reaches thermal equilibrium fast
• Budget-conscious buyers who want genuine FCD100/FPL-53 triplet APO quality without paying the $2,500–$3,000 that competing 4-inch triplets demand — this scope delivers the optical performance at roughly half the price

Accessories & Compatibility

• Explore Scientific Field Flattener (f/5–f/7) – Eliminates field curvature for sharp, flat stars edge-to-edge in deep-sky imaging — a must-have for astrophotography with this scope
• Explore Scientific 8x50 Illuminated Right Angle Polar Finder – Accurate polar alignment with an illuminated reticle for precise tracking during long exposures
• Explore Scientific Twilight I Alt-Azimuth Mount – Smooth manual tracking for visual observing sessions — a natural pairing for grab-and-go use
• Explore Scientific EXOS2-GT Equatorial Mount – GoTo motorized mount with PMC-Eight system for automated object tracking and long-exposure astrophotography
• Explore Scientific Soft-Sided Telescope Case – Padded protection for safe transport to dark-sky locations

Note: A finder scope and carrying case are not included. The pre-installed 2N1 finder scope base accepts most standard finder scopes and guiding systems.