Explore Scientific 127mm f/6.5 Achromatic Refractor with Accessories

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Explore Scientific 127mm f/6.5 Achromatic Refractor with Accessories
Item # ES-DAR127065-01
  • The Explore Scientific AR127 is a 127mm f/6.5 is an air-spaced doublet achromatic refractor telescope with multi-coatings.
  • Rigorously tested before it leaves the factory. Tests include visual inspection as well as interferometric computer evaluation.
  • The Explore Scientific AR127 includes a 2" focuser, 99% reflectivity diagonal, an 8x50 Straight finderscope and a bracket.
  • Stunning images of deep sky objects, double stars, planets, and the moon that are a small fraction of the price of comparable aperture apochromat refractors.


Explore Scientific 127mm Achromatic Doublet Refractor

The classic air-spaced, crown-and-flint, doublet achromatic refractor is reborn with the aim to produce superior-class optical figure in a short (f/6.5) focal length design with Explore Scientific Air-Spaced Doublet AR Series. These optics are an extreme value, produce stunning images of deep sky objects, double stars, planets, and the moon that are a small fraction of the price of comparable aperture apochromat refractors. Finally one can own a diffraction-limited high quality refractor for a relatively modest investment.

Designed to handle the rigors of public star parties and educational outreach, the Explore Scientific AR Series has standard hardware which includes a precision 10:1 two-speed focuser, a 2-inch diagonal, and an 8x50 finder scope. You can be confident that the quality and construction of these telescopes will allow heavy use for many years and are backed with a Lifetime Warranty.

It's All About the Optics!

The optics in their collimatable lens cell are fully multi-coated to eliminate light scatter and maintain image contrast. We precision collimate every Explore Scientific telescope at our factory to give optimum performance. Although you may never need to adjust optical alignment, the AR Series allows for collimating the lens set should the telescope ever require it.

Contrast is further enhanced with multiple baffles that mask and deflect unwanted stray light.

Deluxe 10:1 Two-Speed Focuser...

The Explore Scientific Air-Spaced Doublet AR Series telescopes include a precision 2-inch ten-to-one, two-speed as standard equipment. The eyepiece holder uses a compression ring to prevent the eyepiece or camera barrel from scoring.

On those pristine nights of steady seeing, Saturn's Rings can forever affect the hearts and minds of almost anyone who lays eyes on them. It's nights like these that astronomers like to set up their refractors and push the magnification to the limits, not only to see the magnificence of the planet at greater scale but to really test the optical and mechanical quality of the telescope.

Many telescopes are only supplied with a standard single-speed focuser, you will find that a tiny nudge will throw out focus and turn your night into one of frustration. So we included as standard equipment, on all Explore Scientific AR Series, a ten-to-one, two-speed Crayford-style precision focuser with tension adjustment and lock to obtain and hold perfect focus. We think you'll agree that such precision is worth it.

Universal Mounting Plate...

The Universal Adjustable Mounting Plate of the AR 127 fits on many popular equatorial and Altaz mounts, including mounts supplied by Explore Scientific, Vixen, and Meade LXD55/75.

Instead of using a cast metal part, Explore Scientific's Universal Mounting Plate is made from extruded aluminum for added strength, it is after all what secures your telescope to the mount. We also include adjustment screws and locking bolts to allow adjustments to position the angle of the telescope when it is placed on its mount, an important feature when using an equatorial mount.

2" 99% Reflectivity Diagonal Mirror...

The Two Inch Dielectric Diagonal includes a 1.25" eyepiece holder adapter. 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 Diagonal incorporates a light-weight, one-piece diagonal body that securely cradles the precision polished diagonal flat mirror, insuring precision alignment.

8x50 Finder Scope....

The Explore Scientific 8x50 Finder Scope provides a true field of view of 6°. Its coated optics provide a bright high-resolution image so that many faint stars and nebulosity can be detected for precise aiming.

The front objective can be custom focused to provide a sharp image every time.

Explore Scientific Product Number: DAR127065-00
Additional Information

Additional Information

SKU ES-DAR127065-01
UPC Code 812257010974
Manufacturer Explore Scientific
Telescope Series Explore Double Achro
Optical Design Refractor - Achromatic
Mount Type None - Optical Tube Only
Warranty Lifetime Warranty
Telescope Aperture 127mm
Telescope Focal Length 826mm
Telescope Focal Ratio f/6.5
Limiting Stellar Magnitude 13
Optical Coatings Explore EMD
Tube Color or Finish Gloss White
Optical Tube Outer Diameter 130mm
Length of Optical Tube 863mm
Total Telescope Weight 15.6 lbs.
Dew Shield Included? Yes
OTA Mount Type Dual Rings
Finder Included 8 x 50 Optical Finder
Diagonal Included? Yes - 2" Star Diagonal
Tripod Type Included None, Sold Separately

Customer Reviews 2 item(s)

ES 127mm Achromat
This telescope was an upgrade from a Celestron 102, which was a nice refractor as well. After a few years of using it, I was looking for a more hybrid refractor (and a goto mount that would allow me to view deep sky objects as well as still enjoy good detail on the planets.

I have used this scope on about 15 occasions over 4 months and it was everything I was looking for. The 127mm lens collects plenty of light and provides extremely bright sharp images. I use a variety of different brands of eyepieces (Orion, Celestron, Meade, TMB Planetary and they all serve up very sharp images with this scope. The two-speed focuser was a nice upgrade from my other refractor and it also comes with a very nice 2 star diagonal with 1.25 adapter (every bit as good as the 2 star diagonal I had purchased separately for my other scope. Even better is the sturdy storage/carry case that comes with it - which makes it easy for transport and storing. The 8x50 spotting scope is very nice and has an adjustable focus.

I have spent time viewing Jupiter, the Moon, galaxies, double stars, star clusters and a few nebula (my first view of the ring nebula. I have been particularly impressed with the sharpness while viewing star clusters and double stars. Having decent eyepieces helps too, I'm sure, but even the cheaper eyepieces I have are great to use with this scope. I've pushed this with a nice 3mm eyepiece that I have and although the views seem better (sharper with a 4mm at 206x, the image is acceptable with the 3mm on a perfectly clear night.

There is of course some minor chromatic aberration that's noticeable on the edges of bright objects (such as Jupiter when it was at opposition but, this is an achromat and it does a pretty good job of keeping it to a minimum. I only seem to notice when I'm intentionally looking for the aberration on the edge of a bright object (which is not very often that I'm thinking about this.

I'm using the ES AR127 on an Orion SkyView Pro mount and it's a great combination.

I would highly recommend this scope and would definitely consider buying other products from Explore Scientific. I'll definitely keep this one for a looong time.

Bottom line - this telescope is awesome
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Mike / (Posted on 1/1/2012)
ES AR127
I got this telescope as an upgrade from a nice 4 achro I had (now at my daughters' school. Boy, am I glad I got it. First light was with M35 and the first view at 27X was close to what it looked like in my 4 at 110X. When I took it up to 103X, the cluster was nicely framed with gobs of ice cold points of light. Recently, I took it up to 206X on this complex and got a nice view of nearby Cluster NGC 2158.

Other deep sky objects have been very pleasing to observe in this scope. I've gotten nice clear first time views of M1, M51, the Eskimo Nebula, and much more. M13, M3, M5 and M15 at 206X show inidivual stars winking in and out all across the faces like Christmas tree lights. M11 is drop dead gorgeous at 206X.

Although this telescope is probably better for viewing deep sky objects for which chromatic aberration in general, it does a fair job on other targets. Chromatic aberration is noticeable on Jupiter (I didn't get a good look at Mars with it and I don't observe Venus. But with prolonged observation, I can pick out a good bit of the festoon detail with it. Saturn is better. It really serves up nice images of lunar detail with false color only being discernible to me when I'm looking at the rim of the moon.

The best suprise for me though is being able to observe a fair number of deep sky objects with the AR 127 at very high power (206X and picking out and drawing a lot of detail from the crisp images served up.

The only issue with my particular telescope is that it came with a focuser that was loosey-goosey, tending to slide out when the scope was pointed close to Zenith and with Ultima and Hyperion eyepieces in it (boy these things are the size of small coke cans!!. In a few calls, the good people at OPT and Explore Scientific were able to coach me through tightening it. That's the only reason for giving this scope 4.5 stars. Otherwise, I'd given it a 5 (or 6 if I could LOL.
1= Houston, We Have a Problem & 5= It's Out of This World
Review by Mark Costello / (Posted on 3/18/2011)
Included Items

Included Items

  • Explore Scientific 127mm Achromatic Doublet Refractor
  • Removable Dew Shield
  • Cradle Rings with Handle
  • Universal V Series Saddle Plate
  • 10:1 Two-Speed 2" Crayford Focuser
  • 8x50 Straight Finder Scope
  • Six Point Adjustable Bracket
  • 2" 99% Reflectivity Mirror Diagonal
  • 1.25 " Adapter
Questions & Answers

Product Questions

Does this telescope outfit include a dedicated carry case? One of the reviewers indicated that a case was included.
Is this telescope good for terrestrial "daytime viewing"?
Can you tell me how long the dovetail is?
I am looking at this telescope.  What would be an appropriate alt-az (non-computerized) mount for this scope?
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