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- Explore Scientific ED Air-Spaced Triplet Apochromatic Refractors -


purchase description focal length focal ratio resolution size (l x w in mm) weight
Dealer or Buy Now ED80 Essential Series 480mm f/6 1.45 arcsec 475 x 90 7.5 lb/ 3.4 kg
Dealer or Buy Now ED102 Essential Series 714mm f/7 1.14 arcsec 650.88 x 102.48 11 lb/ 5 kg
Dealer or Buy Now ED127 Essential Series 952mm f/7.5 0.91 arcsec 500 x 100 15 lb/ 6.8 kg
Dealer or Buy Now ED80 Carbon Fiber Series 480mm f/6 1.45 arcsec 431.8 x 96 5 lb/ 2.3 kg
Dealer or Buy Now ED102 Carbon Fiber Series 714mm f/7 1.14 arcsec 660.4 x 120.4 7 lb/ 3.2 kg
Dealer or Buy Now ED127 Carbon Fiber Series 952mm f/7.5 0.91 arcsec 990.6mm x 139.7 11 lb/ 5 kg
Dealer or Buy Now ED152 Carbon Fiber Series 1216mm f/8 0.76 arcsec 1320 x 165 20.5 lb/ 9.3 kg

About Explore Scientific Air-Spaced Triplet Apochromatic Refractors


When the designers at Explore Scientific set their sights on creating a top-quality apochromatic refractor that anyone would be proud to own, they decided on a traditional air-spaced triplet optical design in a rugged, adjustable lens cell. All materials had to be top-notch, so genuine Hoya extra-low dispersion (ED) Dense Fluor Crown (FCD1) glass was chosen, and then experienced craftsmen shaped and polished the elements that would form the foundation of a high-quality, true APO refractor.


All Explore Scientific Air-Spaced Triplet APO Refractors are diffraction-limited at .25PV or better. Special EMD™ enhanced multi-layer coatings are deposited on all optical surfaces, and the result is bright, high contrast images with virtually no light scatter. Interferometic data on your newly purchased and registered Explore apochromatic refractor is available upon request. Time restrictions apply; please contact Customer Service for more information.


While optics are definitely the most important component of any telescope, other features, like the focuser, the finder, and the optical tube, play a crucial role in the design. Below you will find highlights on all of the ingredients used to create Explore Scientific Triplet APO refractors, including a very liberal warranty that speaks volumes about the confidence we have in our telescopes!


Explore Air-Spaced Triplet APO Refractor Highlights…


  • Available in 80mm, 102mm, 127mm & 152mm apertures.

  • Tube assemblies are available in aluminum or carbon fiber.

  • Air-Spaced Apochromatic Triplets…true APO optics.

  • Diffraction limited at .25PV or better.

  • Genuine ED glass from Hoya Japan.

  • Enhanced Multi-Layer Coatings (EMD) are deposited on optical elements to boost contrast and eliminate light scatter.

  • Contrast is further enhanced with the installation of matte black knife-edge baffles in the optical tube assembly.

  • While refractors seldom require additional collimation after initial factory adjustment, the lens cell design allows for consumer collimation. Sending off to the factory is an option, but is not required.

  • 80mm - 127mm models come with a heavy-duty 2" dual-speed focuser.

  • The 152mm model comes with a special edition 3" rack & pinion dual-speed, made for Explore Scientific by Starlight Instruments. A 2" compression ring adapter are part of the package.

  • The 152mm model comes with an 8x50 right-angle finderscope with illuminated polar reticle eyepiece is standard. It provides a wide 6° field of view that is right-side up and left-to-right correct. Great for daytime or nighttime.

  • To attach your Explore Scientific Air-Spaced Triplet telescope to a variety of mounts, we have included the "Vixen-style" dovetail on all telescopes except the 152mm. The 152mm telescope is supplied with a Losmandy style dovetail. The "Vixen-style" plate fits mounts made by Explore, Meade, Celestron, Vixen & others.

  • All Explore Scientific products come with a STAR Extended-Life-of-the-Product Warranty. Upon registration, this product will be under warranty for as long as it is manufactured, plus five years.

    Explore Scientific Air-Spaced Triplets use Genuine HOYA ED Glass


    The Critical Element: Optics


    Explore Scientific uses ED (Extra-low Dispersion) FCD1 (Dense Fluor Crown) glass developed and manufactured by Hoya Optical of Japan. Using the right glass with the appropriate properties enables the production of lenses that offer superior sharpness and color correction..


    The optics used in Explore Scientific ED Air-Spaced Triplet refractors are truly diffraction-limited at .25PV or better. As a privilege of ownership, those who wish to obtain a copy of their interferometric data can request it 90 days after registration of their ED Triplet telescope by contacting the Explore Scientific Customer Service Department.

    Explore Scientific EMD Coatings Provide Superior Contrast


    EMD™ Coatings


    EMD (Enhanced Multi-layer Deposition) Coatings eliminates light scatter and maintains high image contrast. This proprietary coating is applied to all Explore Scientific lenses in multiple layers for added durability.


    Contrast is further enhanced by the installation of multiple baffles in the optical tube that mask and deflect unwanted stray light.

    3-inch Special Edition Starlight Two-Speed Rack and Pinion Focuser


    Special Edition Starlight Instruments 3" Focuser


    The Explore Scientific ED152 Air-Spaced Triplet refractor comes standard with a Special Edition 3" dual-speed Feathertouch focuser, made especially for Explore Scientific by Starlight Instruments. This heavy-duty focuser can easily handle the extra weight of imaging accessories like CCD cameras, filter wheels, etc.


    2-inch Two-Speed Precision Focuser


    High Performance Optics Demand Precision Focusers


    The Explore Scientific ED80, ED102, and ED127 Air-Spaced Triplet Refractors include a high quality precision 2" Dual-speed focuser with micro focus and tension adjustment.


    You will appreciate the smooth movement, the large course and fine focusing knobs, and the graduated scale imprinted on the draw tube. A 1.25" compression ring eyepiece adapter is included.

    Explore STAR Extended and Transferrable Life of the Product Warranty


    Explore STAR Warranty


    We are always striving to improve the quality of Explore Scientific eyepieces and to enhance your experience as a user of our products. This is why we created the Explore STAR Transferrable Extended Life-of-the Product Warranty Program.


    For as long as Explore Scientific manufactures a product it is under warranty, no matter how many times it is sold or traded to another individual. And when we stop manufacturing a given model (referred to as the end of the Life of the Product), we will extend the warranty automatically for another five years.


    Learn More about Explore STAR

    Review of Explore Scientific's Telescopes


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