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Explore Scientific AR102 f/6.5 Air-Spaced Doublet Achromat Refractor Telescope

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ES-DAR102065-01
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  • Regular price $499.99

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  • Aperture: 102 mm (4-inch)
  • Focal Ratio: f/6.5
  • Focal Length: 663 mm
  • Package includes a precision two-speed focuser, a 99-percent Reflective 2-inch Diagonal Mirror, and an 8x50 Finder Scope.

 

DESCRIPTION

Explore Scientific AR102 f/6.5 Air-Spaced Doublet Achromat Refractor Telescope

The AR102 f/6.5 Air-Spaced Doublet Achromat Refractor Telescope by Explore Scientific:

Like its two larger brothers, the AR127, and the AR152, these are classic air-spaced, crown-and-flint, doublet achromatic refractors with superior-class optical figure, in a short (f/6.5) focal length design. 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 apochromatic 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 two-speed focuser, a 99-percent Reflective 2-inch Diagonal Mirror, dew shield, 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 by the Explore Scientific 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 Two-Speed Focuser... The Explore Scientific Air-Spaced Doublet AR Series telescopes include a precision 2-inch two-speed as standard equipment. 


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 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 102 fits on many popular equatorial and Alt-Az mounts, including mounts supplied by Explore Scientific, Celestron, Vixen, and others. 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.

Viewing Comfort and the Preservation of Precious Light... 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 2-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-percent reflective) composed of multiple thin layers of dielectric material delivers maximum light output.


You can thread standard 48 mm filters into the barrel. 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 diagonal flat mirror, insuring precision alignment.


8x50 Finder Scope... 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. The front objective can be custom focused to provide a sharp image every time.

 

OPT Product Number: ES-DAR102065-01 

 

SPECIFICATIONS

Camera/Eyepiece Connection2 Inch Nosepiece
Dawes Limit1.14 arcseconds
Focal Length663 mm
Focal Ratiof/6.5
Free ShippingYes
Limiting Magnitude13.8
ManufacturerExplore Scientific
Optical DesignDoublet
Tube Diameter25.5"; 698mm
Tube Length101mm
Tube Weight10.4 lbs

INCLUDED ITEMS

  • Explore Scientific AR102 f/6.5 Air-Spaced Doublet Achromat Refractor Telescope
  • Cradle Rings with Handle and Universal Saddle Plate
  • Two-Speed Focuser 2.0-inch I.D.
  • 8x50 Finder Scope
  • Dew shield
  • Dielectric-Coated 99-percent Reflective 2-inch Mirror Diagonal with 1.25-inch Adapter

 

 

Customer Reviews

5 Based on 2 reviews
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SF
02/12/2019
Scott F.
United States

Surprising

I have only had it out once, and the waxing moon was out as well. That being the case, I looked at the moon at about 27x. It was visually stunning. There was just a hint of color along the edge of the crescent. Crater detail was excellent, especially along the terminator. I can't wait to get it under dark skies. Great value, if you don't need perfection.

A
08/03/2012
anonymous

Blue

Purchased the Explore Scientific 102mm 4 AR Achro. about month ago as a grab and go scope...I do own TMB 100mm 4 APO / TMB 80mm signature series 3.1 APO both absolutely superb optical instruments .. For star parties....public outreach how can you go wrong...didn't expect much as to performance.. How wrong I was....the optical quality stunned me...planetary, deep sky, lunar , double stars , were first rate...sharp superb contrast delivered ....Saturn was spectacular with incredible ring and planetary detail...it was showed it's metal with lunar views....Venus was stunning... Yes some colour aberration as to be expected but minor and very acceptable...This scope can be used right out of the box..no OTA here ....dielectric 2 diagonal... Finder scope..tube rings...handle....how can you ever go wrong for the price..... Rings