Explore Scientific 102 mm AR Doublet Achromatic Refractor OTA
Explore Scientific will send you a FREE 25 mm 70-degree Eyepiece (a $99 value) when you buy this telescope! Hurry, this special offer ends June 30 or while supplies last!
The AR127 Doublet Refractor by Explore Scientific uses air-spaced doublet optics expertly crafted from crown and flint glass, creating astounding celestial views. You will be wowed by the marvelous views in your scope of the Moon, planets, and double stars. The telescope package includes many high-tech accessories to make your long nights observing a breeze. Accessories include a 2" dual-speed focuser, a one-piece 2" diagonal with 99% dielectric coatings, an 8 X 50 non-illuminated straight -thru finderscope, and a cradle ring assembly with a Vixen-style dovetail mount. All you need are a few eyepieces and an alt-azimuth or equatorial mount and you are ready to explore the skies!
Optics, Optics, 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.
The Explore Scientific Air-Spaced Doublet AR Series telescopes include a precision 2-inch two-speed focuser as standard equipment. The eyepiece holder uses a compression ring to prevent the eyepiece or camera barrel from scoring. 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 two-speed Crayford-style precision focuser with tension adjustment and a lock, to obtain and hold perfect focus. We think you'll agree that such precision is worth it.
The Two-Inch Dielectric Diagonal includes a 1.25" eyepiece holder adapter and dust covers to protect the mirror. Provided as standard equipment, Explore Scientific's Two Inch Dielectric Diagonal incorporates a light-weight, one-piece diagonal body that securely cradles the precision 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 48 mm filters into the barrel.
The Explore Scientific 8x50 Finder Scope provides a true field of view of 6 degrees. Its coated optics provide a bright high-resolution image so that many faint stars and nebulosity can be detected, for precise aiming of your scope.
- Explore Scientific 102 mm Achromatic Refractor
- 10:1 Two-Speed 2" Crayford Focuser
- Cradle Rings w/ Handle
- Vixen-Style Dovetail
- 8x50 Straight Finder Scope
- 99% Reflective 2" Diagonal with 1.25" Adapter
Dimensions & Specifications
Telescope Series: Explore AR Air-Spaced Doublet
Telescope Optical Design: Refractor
Refractor Design: Achromat
Number of Refractor Elements: 2
Telescope Aperture: 4"
Telescope Focal Ratio: f/6.5
Telescope Focal Length: 663 mm
Secondary Mirror Central Obstruction: N/A
Limiting Stellar Magnitude: 12.5
Diagonal Included: Yes - 2" Star Diagonal
Finder Included: Yes - 8 x 50 Finder Included
Focuser Style: Crayford Style
Focuser Size: 2"
Focuser Speed: Dual Speed
Telescope Mount Type: No Mount - OTA Only
Telescope OTA Diameter: 3.96" (100.7 mm)
Telescope OTA Length: 25.5"
Telescope OTA Weight: 10.4 lb
We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.
Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when product is registered on explorescientific.com within 60 days of purchase.
Return & Exchange Policy
At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.
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