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Explore Scientific Essential Series Aluminum 127mm f/7.5 APO Triplet

|, Telescopes, Refractors, Refractors 127-138mm|Explore Scientific Essential Series Aluminum 127mm f/7.5 APO Triplet

Explore Scientific Essential Series Aluminum 127mm f/7.5 APO Triplet


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Great for astrophotography, Explore Scientific’s 127mm Apochromatic Refractor can capture in stunning detail many of the night sky’s most notable treasures.

With its true diffraction-limited optics and ample aperture, this versatile model can showcase deep sky delights like the edge-on Sombrero Galaxy with its distinct bulging center or the spiraling beauty of the face-on Pinwheel Galaxy as easily as it can reveal the intricacies of the Moon’s winding Hadley Rille.

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. As an added bonus, its quick set-up allows you to spend more time at the eyepiece to make the most of your nights under the stars.

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SKU: ES-ED127075-03 Categories: , , ,



Why chose a refractor telescope for astronomy? 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. But why worry? At Explore Telescopes, they precision collimate every Explore Scientific telescope at the factory to give optimum performance. Although you may never need to adjust optical alignment, their ED APOs allow for optical centering to collimate the lens elements should the telescope ever require it. That’s a bonus over fixed models.

The Explore Scientific 127mm f/7.5 ED APO Refractor Telescope is one of the most innovative ideas in high quality apochromatic designs. Beginning with a tube fashioned from aluminum and stainless steel, the difference begins with what goes inside – technology. Explore Scientific uses ED (Extra-low Dispersion) FCD1 (Dense Fluor Crown) glass developed by Hoya Optical of Japan to enable the production of lenses that offer superior sharpness and color correction by minimizing the color dispersion (chromatic aberration, or the “false” color fringing seen around bright objects that happens when light rays pass through standard crown-and-flint doublet objectives). This glass type offers a more durable and long lasting solution to produce an optic to minimize chromatic aberration over delicate fluorite crystal objectives that are prone to fracturing and absorbing moisture. What’s more, these true air-spaced apochromatic triplets have all the refinements like EMD (Enhanced Multilayer Deposition) coatings, which absolutely eliminates light scatter and maintains image contrast. Contrast is further enhanced with multiple baffles that mask and deflect unwanted stray light.

So, now we’ve set the scene… Here’s a mechanically perfected set of optics but the next step is how to hold them in place so they can be used. What’s Explore Telescope’s answer? Make it so chances are you already have what it takes to mount an Explore Scientific 127mm f/7.5 ED APO Refractor Telescope already in your fleet – or to offer a high quality mount which will become an asset to your hobby. You can mount the ED 127 to many popular equatorial and Altaz mounts, including Explore Scientific’s new TwiLight I and TwiLight II Altazimuth Mounts. Photographers, who are looking for super high resolution optics, can mount the optical tube assembly to their existing medium-duty camera tripod. A release knob allows the tube assembly to rotate so that the camera can be positioned at any angle. The Universal Adjustable Mounting Plate of the 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.


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Explore Scientific 127mm f/7.5 ED APO Refractor Telescope Features

  • Included Saddle Plate Fits Explore Scientific Mounts; Vixen Mounts; Meade LXD55/75 Mounts
  • Tube Weight with Standard Accessories: 15 lbs – 6.8 kgs.
  • Rack and Pinion Focuser
  • Two Inch Dielectric Diagonal
  • Dew Shield
  • Superior Hoya ED Optical Glass and EMD (Enhanced Multilayer Deposition) Coatings


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 Essential Series Aluminum Air-Spaced Triplet Refractor
Item NumberES-ED127075-03
Focal Length952mm
Focal Ratiof/7.5
Resolution.9 arcsec
Tube Length
w/ Dew Shield
41.75″; 1060mm
Tube Length
w/out Dew Shield
33.25″; 849mm
Weight18lb; 8.16kg

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