Explore Scientific ED APO 127 f/7.5  FCD-100 Alu HEX OTA

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Explore Scientific
Telescope Type
APO Triplet Refractor
Aperture (mm)
127 mm
Explore Scientific ED APO 127 f/7.5 FCD-100 Alu HEX OTA is a triplet ED APO with 127mm aperture, FCD-100 objective lenses, lightweight aluminium tube and precision HEX focuser with gear reduction drive!
  • Three lens apochromat with two air spaces
  • Aperture 127mm; focal length 952mm; f/7,5
  • HOYA FCD-100 glass for maximal color fidelity
  • High end 2,5" Hexafoc 10:1 DeLuxe Focuser
  • 2" Star Diagonal 99% included
  • Extension tubes for focusser (2pcs)
  • Handle features mounting place for cameras
  • 44mm universal dovetail with stainless steel protection included (Fits Super/Great Polaris, EQ5, LXD75, EXOS-II)
  • Dewshield slides onto tube for easy transport
  • Hybrid viewfinder shoe to accept different viewfinder holders

Highly corrected 127mm air-spaced triplet apochromat (with three lenses) and aluminium tube and a 2.5" high-precision HEXAFOC focuser. NEW: Now with hybrid viewfinder shoe to accept different viewfinder holders.  

Apochromats are the ultimate choice in small to medium sized telescopes: the combination of compactness, transportability, very high image contrast and sharpness together with the possibility to make excellent astrophotos cannot be bested. The advances in glass manufacturing during the last few years have made true apochromats available to more astronomy enthusiasts than ever before. The new Explore Scientific FCD-100 Alu Hex represents another major improvement in this field - the overall correction (color and spherical) is setting new standards in this price class. The optical design shows a polystrehl value of 0,97 indicating a level of correction that is absolutely top of the line.

This excellent apochromat is a very versatile telescope: the fast f-ratio makes short exposure times possible. The high contrast and sharpness of the image provide breathtaking views of large objects like the North america nebula or the Andromeda galaxy as well as tack sharp planetary images. The telescope is lightweight and compact - the dew shield slides down the tube to minimize size for transportation. Revolutionary glass and precision manufacturing created a telescope that offers observing joy on the highest level. This does not only qualify this telescope as the ideal travel scope, it is also the perfect choice for fast observations and for astrophotography. The excellent 2,5" HEXAFOC focuser with 10:1 reduction is perfect for this - the large inner diameter of 65mm prevents vignetting by the focuser when the telescope is used for astrophotography with large sensors.

These very popular EXPLORE SCIENTIFIC Triplet ED APO Refractors we do offer in 3 different product lines:

Essential Line: 
HOYA FCD-1 Glass lens, AL-Tube, 2.0" Rack&Pinion Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112084(AL), 0112106(AL), 0112132(AL)), 0112155(CF + 3"FT)) 

Professional Line: 
HOYA FCD-100 Glas lens, AL/CF-Tube, 2.5" HEXAFOC Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112086(AL), 0112108(AL), 0112109(CF), 0112134(AL), 0112135(CF))

High-End Line: 
OHARA FPL-53 Glass lens, Carbon(CF) Tube, 3.0" Feather-Touch Focusser with 1:10, 2.0" Star Diagonal 99% Reflectivity (see Part No. 0112165(CF))


  • Aperture: 127mm
  • Focal Length: 952mm
  • Focal ratio: f/7,5
  • Design: Apochromat with three lenses, two air spaces and FCD-100 glass
  • Weigth: 7,7kg
  • Backfocus: 150mm above 2" adaptor
  • Hybrid viewfinder shoe to accept different viewfinder holders


  • Optical tube with retractable dew-shield
  • 2.5" HEX focuser with 1:10 gear reduction  
  • 2" Star Diagonal 99% reflectivity
  • Tube rings with dovetail plate and handle
  • Dust caps for front-lens and focuser
  • Hybrid viewfinder shoe 

Technical Data

Field of application
  • Deep Sky Observation
  • Lunar observation
  • Lunar photography
  • Planetary observation
  • Planetary photography
  • Deep Sky Photography
Focus Group
  • Advanced Amateurs
  • Specialists and Research
  • Visual enthusiasts
Product Family Refractor telescope
Optical design Apochomatic Refractor
Magnification from 25
Maximum recommended magnification 260
ED glass
Mirror/Lens diam. 127 mm
Focal length 952 mm
Aperture ratio 7
Angular resolution 1.08 arc seconds
Type of coating Enhanced Multilayer Desposition (EMD)
Material OTA Aluminium
Focusing system 2.5" Hexafoc DeLuxe with 10:1
Mount Type Optics without Mount
Extended warranty 10 years
Net weight OTA (incl. accessories) 7.7 kg
Total length 80 cm
Total width 18 cm
Total height 18 cm
What's in the Box
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