Explore Scientific 102mm FCD100 f/7 ED APO Triplet Refractor


  • Aperture: 102 mm (4-inch)
  • Focal Ratio: f/7
  • Focal Length: 714 mm
  • Premium quality refractor for long observation sessions


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  • Regular price $1,899.99
  • $1,599.99
  • You save: $300.00 (15%)

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Explore Scientific 102mm FCD100 f/7 ED APO Triplet Refractor

Expose the wonder of Earth's celestial neighborhood with the Explore Scientific 102 mm FCD100 Refractor. You'll experience the beauty of the barren lunar landscape, the smooth elegance of Saturn's ring structure, the most luminous deep sky objects in the Messier catalog, and more! 

For all intents and purposes, the 102 mm FCD100 is the same instrument as the Explore Scientific 102 mm Essential Series Refractor, but with higher quality optics. Explore Scientific uses Hoya FCD100 extra-low dispersion (ED) glass which has characteristics analogous with Ohara FPL-53 glass. With a true diffraction-limited optical design and compact size, the 102 mm FCD100 is a premium quality refractor that has been made to inspire impromptu stargazing adventures. 

By combining Hoya FCD100 optics with Explore Scientific's proprietary EMD enhanced multi-layer coatings on all optical surfaces, the 102 mm FCD100 air-spaced triplet refractor produces radiant images with high contrast while avoiding chromatic aberrations almost entirely. 

This incredible little scope also comes with a 2.5-inch Hexagonal focuser that features an extremely rigorous design and support for up to 10-pounds of accessories. 

Also included is a 99-percent reflective 2-inch Diagonal.

Even though the 102 mm FCD100 is an outstanding telescope by itself, it is also small enough to mount on a larger instrument. This gives you flexibility when astroimaging by splitting guiding and imaging responsibilities between the two scopes. 


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ManufacturerExplore Scientific


  • ES 102 mm FCD100 f/7 ED APO Refractor OTA
  • 2.5-inch Hexagonal Focuser
  • 99-percent Reflective 2-inch Diagonal