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Explore Scientific AR127 Air-Spaced Doublet Achromat Refractor

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Product Description

Optical Design: Air-Spaced Doublet Achromatic Refractor
Clear Aperture: 127mm
Focal Length: 825mm
Focal Ratio: f/6.5
Resolving Power: .9 arc seconds
Coatings: Fully Multi-Coated
Limiting Stellar Magnitude: 13
Focuser: Two-Speed Crayford-Style, w/ Adjustable Tension and Lock
Finder Scope: 8x50 Straight; Adjustable Objective Focus; Dual-Ring, Six-Point, Bracket w/Quick Release Shoe
Cradle/Saddle Plate: Dual Ring Style - Fits Explore Scientific Mounts; Celestron Mounts; Vixen Mounts; Meade LXD55/75 Mounts
Tube Diameter: 5.13" - 130.4mm
Tube Length: 34" - 863.6mm
Tube Construction: Aluminum; Stainless Steel
Optical Tube Assembly Weight (with all standard accessories): 15 lbs - 6.8 kgs.
  • 127mm models are f/6.5.
  • The tube assembly is constructed from aluminum and stainless steel and painted gloss white.
  • Classic Air-Spaced Doublet achromat optics made with Crown & Flint glass


  • Research-grade, diffraction limited optics.
  • Enhanced Multi-Layer Coatings (EMD) are deposited on optical elements to boost contrast and eliminate light scatter.
  • While refractors seldom require additional collimation after initial factory adjustment, the lens cell design allows for consumer collimation. Sending off to the factory is an option, but is not required.


  • Come with a heavy-duty 2" Crayford-style two-speed focuser.
  • The heavy-duty 2" diagonal has 99% dielectric coatings for high contrast, bright images. A 1.25" compression ring adapter is included.
  • Includes an 8x50 straight-thru finderscope with a wide 6° field of view. The front objective is focusable.
  • To attach your Explore Scientific Air-Spaced Doublet telescope to a variety of mounts, we have included an extra strong extruded aluminum Cradle Ring Assembly and Universal Adjustable Mounting Plate. The "Vixen-style" plate fits mounts made by Explore, Meade, Celestron, Vixen & others.

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