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Explore Scientific 127mm f/7.5 CF FCD100 Triplet Refractor Telescope

SKU : ES-FCD100-127075-CF-01

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  • 127mm Air Spaced Triplet APO
  • Carbon Fiber Body — Only 14 lbs.
  • Focal Ratio: f/7.5
  • Focal Length: 952 mm
  • Premium Hoya FCD100 Optics
  • Integrated Dew Shield
  • 2.5-inch HEX R&P 10:1 Focuser
  • 99% Reflectivity 2" Diagonal


Product Details

  • The Explore Scientific 127mm f/7.5 CF Triplet APO Refractor Telescope with Hoya FCD100 optics and Integrated Dew Shield is a fantastic telescope for both visual observation and astrophotography.

    Reveal celestial wonders like the desolate beauty of the lunar terrain, the serene structure of Saturn’s rings or the brightest deep sky treasures of the Messier catalog with Explore Scientific’s FCD100 Series 127mm f/7.5 Air-Spaced Triplet in lightweight Carbon Fiber!

    This telescope has all the great features of the original EDT-127075-CF but includes genuine HOYA's premium FCD100 ED glass which is nearly identical in characteristics as OHARA's FPL-53. Relying on technological innovation, they have successfully launched the mass production of high-performance optical glass at the apex of the FCD family. Combining it with optical glass of high refractive index allows us to achieve unprecedented advanced chromatic aberration correction. HOYA FCD100 is considered one of the premier ED glass types available.

    Having a true diffraction-limited optical design and sized to encourage spontaneous stargazing sessions, this high-quality telescope is a perfect grab-and-go instrument for exploring the skies. Featuring an air-spaced triplet optical design that virtually eliminates chromatic aberrations, this telescope generates brilliant high-contrast images by combining genuine HOYA FCD100 extra-low dispersion (ED) glass and proprietary EMD enhanced multi-layer coatings on all optical surfaces. In addition, this amazing scope also includes a new 2.5-inch Hexagonal focuser with very rigid design and strong support. Up to 10-pounds of gear can be loaded onto this focuser.

    This 127mm telescope is designed to work with Explore Scientific’s 3-inch Field Flattener/0.7x Focal Reducer, though an additional adapter found here is required to thread it directly into the 127mm's stock 2.5" HEX focuser. Once you integrate the 0.7x Focal Reducer, the telescope reduces down from a 952mm f/7.5 system to be 666mm at f/5.25, which is a very fast and well-corrected system for deep sky astrophotography. If you're looking for a flat field for imaging at the full 952mm focal length, the HoTech SCA Field Flattener is a great choice.


      Additional Specifications:
    • Limiting Magnification: 13
    • Resolution: 0.9 Arcsec
    • Tube Length: 33.25-inches (849 mm)
    • Tube Length with Dew Shield: 41.75-inches (1060 mm)
    • Tube Diameter: 5.7-inches (145mm)
    • Dew Shield Outer Diameter: 7-inches (177mm)
    • Dovetail Style: Vixen


  • specifications

    Aperture127 mm (5")
    Dawes Limit0.91 arcseconds
    Dew Shield IncludedYes
    Focal Length952 mm
    Focal Ratiof/7.5
    Glass TypeHoya FCD100
    Highest Magnification254x
    Light Gathering Power329x
    Limiting Magnitude14.3
    Optical DesignTriplet Refractor
    Tube Diameter130mm
    Tube DiameterWith Dew Shield/ 177.8 mm (7")
    Tube Length33.25" (849 mm)
    Tube LengthWith Dew Shield/ 41.75" (1060 mm)
    Weight14 lb (10 kg)
  • included items

    • Explore Scientific 127mm Carbon Fiber f/7.5 Air Spaced Triplet with Hoya FCD100 optics
    • Integrated Dew Shield
    • 2.5-inch HEXagonal Rack and Pinion 10:1 two-speed Focuser
    • Cradle Ring with Handle
    • Vixen Style Dovetail Plate
    • Explore Finder Scope Base installed on scope
    • 99-percent Reflective 2-inch Diagonal
    • Weighs 14 lbs.
    • (Case and Finder Scope NOT Included)

Product Reviews

Customer Reviews
4.8 Based on 4 Reviews
5 ★
4 ★
3 ★
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  • foam
  • golf club bag case
  • tension
  • image
  • field flattener
  • case
  • dew shield
  • Orion
  • Moon
  • DSLR
A OPT Telescopes Customer
Brian F.
United States United States

Fantastic Scope, Sharp Optics

I purchased this scope but upgraded the stock focuser to a 3" Feathertouch and now I have an astrophotography machine. Pair it with the ES 0.7x reducer/flattener for fast f/5.2 imaging at 666mm, or use the HoTech SCA Flattener for a flat field when imaging at the native 952mm. Highly versatile scope with excellent optics — I get very sharp stars with either of the above combos. My only gripe is that both the ES 0.7x reducer/flattener and the HoTech SCA Flattener both end in M42 connections. Both companies should update these products to feature M48 or even M54 connections, which are much more compatible with full frame systems without vignetting. Personally, I'm using an APS-C sized sensor so it doesn't affect me.

OPT Telescopes Explore Scientific 127mm f/7.5 CF FCD100 Triplet Refractor Telescope Review
Eric G.
United States United States

Awesome scope

The scope is great. I took my first image of Orion and was surprised at how flat the image was. It was recommended to buy a field flattener, and I did, but still, the image was great on my full frame DSLR. The integrated dew shield works as it should. Not to little tension, not too much. The same night I also used the included diagonal and looked at the moon. It was the most crisp image of the moon I've ever seen. I've had an 8 inch sct for years, and it's great, but I love this scope. It doesn't come with a case, but I improvised and used a golf club bag case, added some foam, and it's perfect.

OPT Telescopes Explore Scientific 127mm f/7.5 CF FCD100 Triplet Refractor Telescope Review
John O.
United States United States

Best APO refractor for the money

You can see the results by visiting my web site, Robert's scope must have been damaged somehow. I'm sure Scott at Explore Scientific will fix it for him.

United States United States

Was everything I expected

I have been eyeing this scope with HOYA glass for a year and decided to pull the trigger and purchase it. With the steep discount on this scope and a fare trade-in for my RC 8" I was able to finally get this one. Working in the semiconductor field for many years I am very familiar with the excellent quality of HOYA glass to provide extremely sharp images. I only gave it four stars until I get first light on it soon. I am in the process of replacing the HEX focuser with a 3-inch rack-n-pinion FeatherTouch Focuser with stepper motor to take advantage of the F.T. focusing electronics I have with my other refractor. Nothing wrong with the HEX rack-n-pinion focuser, just wanted to upgrade it. I also replaced the dovetail mounting bar with a three inch Losmandy bar for better scope stability while imaging. Thanks to the OPT staff working with me to finally obtain it.