Explore Scientific AR102 f/6.5 Doublet Refractor w/ Twilight I Mount

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Explore Scientific AR102 f/6.5 Doublet Refractor w/ Twilight I Mount
$549.99
Item # ES-D102065MAZ01
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  • The Explore Scientific AR102 f/6.5 Doublet Refractor Telescope is a classic air-spaced, crown-and-flint, doublet achromatic refractor with a superior-class optical figure in a short focal length design.
  • Package includes a precision two-speed focuser, a 99% Reflective 2-inch Diagonal Mirror, dewshield, 8x50 Finderscope, and heavy-duty tripod.
  • The Explore Scientific AR102 f/6.5 Doublet Refractor Telescope incorporates a collimatable lens cell that is fully multi-coated to eliminate light scatter and maintain image contrast.
  • This Explore Scientific Twilight I Alt-Azimuth Mount has a weight capacity of 15 lb.
  • Twilight I Mount allows quick and easy viewing with small or mid-sized telescopes.
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Explore Scientific AR102 f/6.5 Doublet Refractor


The Explore Scientific AR Series telescopes are classic air-spaced, crown-and-flint, doublet achromatic f/6.5 refractors with a superior-class optical figure. Whether you choose the AR102 (4"), AR127 (5") or AR152 (6") model, you will be impressed by the stunning images revealed to you at the eyepiece, and all at a small fraction of the price you'd pay for a comparably sized apochromatic refractor.

Designed to handle the rigors of public star parties and educational outreach, the Explore Scientific AR Series telescopes come with heavy-duty, high quality components, including a 2" dual-speed Crayford-style focuser, a one-piece 2" diagonal with 99% dielectric coatings, an 8 X 50 non-illuminated straight-thru finderscope and quick release bracket, and a cradle ring assembly with Vixen-style dovetail mount. Just add a few eyepieces and the alt-azimuth or equatorial mount of your choice and you'll be ready to discover the Universe!

Interferometic data on your newly purchased and registered Explore apochromatic refractor is available upon request from Explore Scientific after 120 days of ownership.

Explore Scientific Twilight I Alt-Az Mount


The Twilight I is a light-to-medium-duty alt-azimuth mount and tripod designed to quickly and easily accept small to medium sized refractors, such as the ES AR102 or Carbon Fiber 102mm, and of course, the 80mm. Light weight, fast Newtonians will also match up nicely with the Explore Twilight I mount. As long as your telescope does not exceed 15 pounds, you are good to go, and if it does, then take a look at the Twilight II, which we'll talk about below.

The Twilight I alt-azimuth mount head is made of powder-coated aluminum and there are worm gears on both axes. The adjustable angle head can be tilted forward or back at a 45° angle, or you can point it straight up for viewing at the zenith. Slow motion control cables are attached on the vertical and horizontal axes, and are easy to turn during the night, even with gloves on, due to the over-sized knurled knobs that are attached to the end of each cable. A small wrench is included with this package, and is stored in the fork arm and held in place with a magnet. If you need to make quick adjustments to your mount, it is a snap to access the wrench and then store it safely away when done. It is a small thing, but an adjustment wrench is one less tool you will need to remember to bring with you on observing sessions!

The chrome-plated steel tripod that comes standard with the Twilight I mount has adjustable legs and a wide foot print of 42 inches, which makes the tripod more stable. A spreader bar locks against the inside of the legs to secure the tripod even further, and keep vibrations to a minimum.

Explore Scientific Product Number: D102065MAZ01

Additional Information

Additional Information

SKU ES-D102065MAZ01
UPC Code 812257010110
Manufacturer Explore Scientific
Telescope Series Explore Double Achro
Optical Design Refractor - Achromatic
Mount Type Alt-Azimuth - Manual
Warranty Lifetime Warranty
Telescope Aperture 4"
Telescope Focal Length 633mm
Telescope Focal Ratio f/6.5
Limiting Stellar Magnitude 12.5
Optical Coatings Explore EMD
Tube Color or Finish Gloss White
Length of Optical Tube 25.5"
Optical Tube Weight 10.4 lb.
Mount Weight 6.6 lb.
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 Heavy Duty Stainless Steel
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Included Items

Included Items

  • Explore Scientific AR102 f/6.5 Doublet Refractor Telescope
  • Twilight I Alt-Az Mount
  • Heavy Duty (HD) Tripod
  • Cradle Rings with Handle and Universal Saddle Plate
  • Two-Speed Focuser 2" I.D.
  • 8x50 Finderscope
  • Dewshield
  • Dielectric-Coated 99% Reflective 2" Mirror Diagonal with 1.25" Adapter
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