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Explore Scientific

Explore Scientific FCD100 Series 127mm f/7.5 Aluminum Air-Spaced Triplet ED APO Refractor Telescope FCD100-127075-02

Explore Scientific FCD100 Series 127mm f/7.5 Aluminum Air-Spaced Triplet ED APO Refractor Telescope FCD100-127075-02

$2,499.99
$2,499.99
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The Explore Scientific FCD100 Series 127mm f/7.5 air-spaced triplet ED APO refractor telescope is a premium instrument built for demanding visual observing and astrophotography. An apochromatic (APO) triplet uses three lens elements — including Hoya FCD100 extra-low-dispersion glass — to bring all colors of light to a single focus, producing exceptionally sharp, high-contrast, false-color-free views and images.

With a 127mm aperture and 952mm focal length (f/7.5), this refractor combines serious light-gathering with the color correction and mechanical quality that discerning observers and imagers expect, feeding light to a robust 2.5-inch HEX focuser.

Who it's for

Built for serious visual observers and astrophotographers who want a large, premium APO refractor for sharp, color-accurate performance. New to the hobby? See our guide on how to pick your first telescope.

Key features

  • 127mm FCD100 air-spaced triplet APO with Hoya ED glass for false-color-free sharpness.
  • 952mm focal length (f/7.5) balancing high resolution and a usable field.
  • 2.5-inch HEX focuser for precise, load-bearing focus with cameras.
  • Premium optical and mechanical quality for visual and imaging use.
  • Excellent color correction for high-contrast lunar, planetary, and deep-sky views.

What you'll see

The 127mm APO delivers razor-sharp, high-contrast views — crisp lunar detail, Saturn's rings and Cassini division, Jupiter's belts and moons, tight double stars, and bright deep-sky objects rendered with pinpoint stars and true color. On a tracking mount it's a superb astrophotography telescope for wide-field and deep-sky imaging.

Specifications
Brand Explore Scientific
Model FCD100-127075-02
Optical design FCD100 air-spaced apochromatic triplet
Aperture 127 mm
Focal length / ratio 952 mm, f/7.5
ED glass Hoya FCD100
Focuser 2.5-inch HEX

Frequently asked questions

What makes an FCD100 APO special?
Its three-element design with Hoya FCD100 ED glass eliminates false color (purple fringing), delivering sharp, high-contrast, color-accurate images prized for both visual use and astrophotography.

Is this an optical tube only?
Yes, it's an optical tube assembly. You'll need a suitable mount (and, for imaging, a field flattener and camera).

Is it good for astrophotography?
Yes. Its color correction, focal length, and 2.5-inch HEX focuser make it an excellent imaging refractor on a tracking mount.

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Frequently Asked Questions

With a beginner telescope you can see a surprising amount — the craters and mountains on the Moon, the rings of Saturn, the moons of Jupiter, and star clusters like the Pleiades. As you get more comfortable, you can also spot nebulae and distant galaxies. Not sure which beginner telescope is right for you? Check out our Telescope Buying Guide.
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All telescopes on Telescope Wolves are hand-picked with beginners in mind. If you're unsure which telescope is right for you, check out our Telescope Buying Guide.
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