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Explore Scientific Carbon Fiber 127mm f/7.5 APO Triplet

|, Telescopes|Explore Scientific Carbon Fiber 127mm f/7.5 APO Triplet

Explore Scientific Carbon Fiber 127mm f/7.5 APO Triplet


Available on backorder

From our Moon’s chiseled craters to Jupiter’s orderly cloud belts to the blue-white stars of the Orion Nebula popping against the complex misty cloud they call home, Explore Scientific’s Carbon Fiber 127mm Apochromatic Refractor can open up a treasure trove of night sky treats.

A nice compromise between portability and aperture, this versatile high-end telescope offers true diffraction-limited optics and has an objective lens size that performs well in lunar, planetary and deep sky viewing situations.

Featuring an air-spaced triplet optical design that virtually eliminates chromatic aberrations, this telescope generates brilliant high-contrast images by combining genuine HOYA extra-low dispersion (ED) glass and proprietary EMD enhanced multi-layer coatings on all optical surfaces.

Its carbon fiber optical tube assembly encourages use by reducing weight and eliminates focus change attributed to shrinking or expansion caused by temperature fluctuations.

Includes the 2″ 99% reflective diagonal and the cradle rings.

Available on backorder

SKU: EDT-127075-CF-01 Categories: ,



The Explore Scientific 127mm f/7.5 Air-Spaced Triplet ED APO produces a visual experience that is often compared to much larger aperture reflector telescopes. The contrast and resolving power can reveal stunning detail on planets and deep sky objects alike.

The designers of the Air-Spaced Triplet ED Apo Series pursued to produce top-quality refractors with lasting value. The optimal solution was to provide a traditional air-spaced design mounted in a rugged, adjustable lens cell. This design, shaped from experienced craftsmanship and polished from genuine HOYA FCD1 (Dense Fluor Crown) ED (Extra-low Dispersion) glass, a critical element to produce images that refractor aficionados know can only be obtained with a high-quality true apochromat.

The owner of an Explore Scientific ED Apo will appreciate the attention to detail and the standard hardware which includes a precision two-speed focuser and a 2″ 99% reflective dielectric diagonal.

All Explore Scientific ED Apochromatic Refractor telescopes include a precision Ten-to-One, Dual-Speed Focuser as standard equipment. The eyepiece holder uses a compression ring to prevent the eyepiece or camera barrel from scoring.

Exploring the fine features around the Moon’s Hadley Rille will put to test observing skills of any astronomer as well as the precision of telescope optics. Better optical quality dictates more precise focusing.

This is especially true when observing at high magnification or when making CCD images. With a standard focuser, you will find that a tiny nudge will throw out focus and turn your night into one of frustration.

So Explore Scientific included as standard equipment, on all ED Apos, a ten-to-one, two-speed Crayford-style precision focuser with tension adjustment and lock to obtain and hold perfect focus. They think you’ll agree that such precision is worth it.

Explore Scientific precision collimates every Explore telescope at their factory to give optimum performance. Although you may never need to adjust optical alignment, the ED Apos allow for optical centering to collimate the lens elements should the telescope ever require it. One of the bonuses of ownership of a refractor is that, compared to standard reflector telescopes, they almost never require re-aligning of the optics (collimation). However, any telescope that is subjected to shock may require optical alignment.

Removing the dew shield, you can access the alignment screws, which you can adjust yourself by referring to the instructions. You can also send it to Explore Scientific’s Service Center for alignment. A standard service charge applies.

The Two Inch Dielectric Diagonal includes a 1.25″ eyepiece holder adapter and dust covers to protect the mirror. The purpose of a diagonal is to securely hold your eyepiece and to give you a comfortable viewing angle.

Provided as standard equipment, Explore Scientific’s Two Inch Dielectric Diagonal incorporates a light-weight, one-piece diagonal body that securely cradles the polished diagonal flat mirror, insuring precision alignment. Ultra-high reflective coatings (99% reflective) composed of multiple thin layers of dielectric material delivers maximum light output.

Both 2″ and 1.25″ eyepiece holders use compression rings instead of a simple set-screw to more securely hold your valued eyepiece (or imaging device) and to minimize scoring of eyepiece barrels. You can thread standard 48mm filters into the barrel.

Although it cost more, Explore Scientific chose carbon fiber for the telescope tube and dew shield for its high strength-to-weight ratio and it’s low expansion characteristics when subjected to temperature variations. This helps to keep the instrument light in weight and keeps the instrument focused even if the temperature drops.

Even though this telescope uses a carbon fiber tube making it much lighter, they supply a handle to easily grip the telescope for mounting and placing it back in its case. In addition, Explore Scientific slots the handle to accept a standard 1/4×20 bolt to attach a camera.

The Universal Adjustable Mounting Plate of ED 127 fits on mounts supplied by Explore Scientific, Vixen, and Meade LXD55/75. It also attaches to photo tripods with standard USA or European thread attaching knobs. You can mount the ED 127 to many popular equatorial and Altaz mounts, including Explore Scientific mounts.


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    • Explore Scientific Carbon Fiber ED127 f/7.5 Air-Spaced Triplet Apochromatic Refractor


  • 2″ Diagonal
  • 10:1 Focuser
  • Dew Shield
  • Cradle Rings
  • Carrying Handle
  • Vixen-Style Dovetail


Apochromatic (ED APO) lenses are designed to bring all the colors into focus in the same plane where as Achromatic lenses are corrected to bring two wavelengths into focus in the same plane.

Chromatic aberration is the phenomenon of different colors focusing at different distances from a lens. Telescope objective lenses for wide-band digital imaging in astronomy must have apochromatic correction, as the optical sensitivity of typical CCD imaging arrays can extend from the ultraviolet through the visible spectrum and into the near infrared wavelength range. Apochromatic designs require optical glasses with special dispersive properties to achieve three color crossings. Explore Scientific achieves this using high-quality ED (Extra-Low Dispersion) glass from Hoya and Ohara.

DescriptionED127mm Carbon Fiber Air-Spaced Triplet Refractor
Item NumberEDT-127075-CF-01
Focal Length952mm
Focal Ratiof/7.5
Resolution.9 arcsec
Tube Length
w/ Dew Shield
39″; 991mm
Tube Length
w/out Dew Shield
33.25″; 844mm
Weight14lb; 6.4kg