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Explore Scientific - AR127 f/6.5 Air-Spaced Doublet Achromat Refractor with Twilight 1 Tripod Assembly

  • Explore Scientific - AR127 f/6.5 Air-Spaced Doublet Achromat Refractor with Twilight 1 Tripod Assembly
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Product Description

This Explore Scientific AR127 refractor has a 127mm (5”) diameter multicoated doublet objective lens (825mm focal length f/6.5). It has diffraction limited optics that are sharp and well suited to serious deep space observing of binary stars, star clusters, and the brighter nebulas and galaxies, in addition to excellent high contrast planetary and lunar images. The objective lens cell is fully collimatable, using push/pull collimation screws, so you can optimize your image quality.

The 5” Explore Scientific AR127 doublet refractor is a great grab-and-go scope for quick looks at the sky when mounted on the lightweight and stable Twilight 1 altazimuth mount. It is also good enough optically to be the heart of a reasonably-priced serious observing and imaging system when mounted on one of the many equatorial mounts from Celestron, Meade, iOptron, and others.

Some chromatic aberration is visible on stars and objects of 2nd or 3rd magnitude and brighter, as you would expect in an achromatic refractor with such a fast focal ratio. However, the spurious color is well controlled and not unreasonable, thanks to careful optical design, and has little effect on deep space observing. Most observers feel the relatively limited amount of chromatic aberration visible is a small price to pay for the scope’s many other virtues of portability, sharpness, contrast, and optical clarity.

This Explore Scientific 5” refractor/altazimuth mount package has:
  • big 5” aperture fully multicoated AR127 achromatic doublet refractor optics
  • user collimatable objective lens cell for fine-tuning the images
  • big 8 x 50mm finderscope
  • 2” dielectric star diagonal with 1.25” eyepiece adapter
  • tube rings with carry handle and Vixen-style dovetail plate
  • Twilight 1 altazimuth mount with slow motion controls
  • forever transferrable warranty

Details About This Package . . .
  • Achromatic refractor optics: 5” (127mm) aperture, 825mm focal length, f/6.5 air-spaced crown and flint glass doublet lens. Tube diameter is 5.13” (130.4mm) and the tube length with dewshield installed is 34” (864mm). Scope weight is 15 pounds (6.82 kg).
  • Collimatable lens cell: The 5” Explore Scientific lens is precision collimated at the factory to give optimum performance. Although you may never need to adjust optical alignment, the ES127D allows for collimating the lens set should the telescope ever require it due to a fall or very rough handling.
  • Multicoated optics: Fully coated on all surfaces with multiple layers of antireflection materials for high light transmission and good contrast.
  • Internal light baffles: Multiple internal knife-edge baffles in the optical tube mask and deflect unwanted stray light for improved contrast.
  • Dew shield: The removable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves visual and photographic contrast by shielding the lens from off-axis ambient light (the neighbor’s yard light, moonlight, etc.)
  • Dust covers: Front and rear dust covers are provided.
  • Dielectric star diagonal: 90° viewing angle first surface mirror 2” star diagonal with 1.25” eyepiece adapter. The diagonal uses durable 99% reflectivity for maximum light transmission and long life.
  • Finderscope: 8 x 50mm straight-through achromatic design, in a dual-ring six-point adjustment bracket with a quick release mounting shoe. Focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus.
  • Dovetail tube mount: The optical tube comes with two split and hinged tube rings for installing the optical tube on your mount. The rings are connected to an industry-standard Vixen-style dovetail mounting plate that slips into the dovetail groove on the supplied Explore Scientific Twilight 1 mount, as well as equatorial mounts from Celestron, iOptron, and others. A carrying handle is conveniently fitted to the top of the tube rings.
  • Twilight 1 altazimuth mount: The supplied Twilight I light-to-medium-duty altazimuth mount weighs only 17.6 pounds (8 kg). It has a payload capacity is 18 pounds (8.2 kg), so it can handle the 15 pound 127mm doublet optical tube with ease. It has worm gear slow motion controls on both axes to let you smoothly follow the motion of the Moon, planets, and deep space objects across the heavens. The cast aluminum single arm and head can tilt forward or back at a 45° angle, as well as point straight up, depending on your observing preferences. The chrome-plated steel tripod of the Explore Scientific Twilight I mount has adjustable height legs. With the legs fully retracted, the tripod is 38.5". With the legs fully extended, the tripod is 55.5" high at highest point.


Name Explore Scientific - AR127 f/6.5 Air-Spaced Doublet Achromat Refractor with Twilight 1 Tripod Assembly
Manufacturer Explore Scientific
Model EXP-DAR127065mz1
UPC 812257017867
Manufacturer Part # EXP-DAR127065-MAZ-01
Telescope Aperture 4.1" - 5"
Aperture 127mm
Diameter 130mm
Focal Length 826mm
Focal Ratio f/6.5
Focuser 2" Two Speed Focuser
Limiting Stellar Magnitude 13
Optical Tube Length 863mm
Resolution .9 arcsec

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