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Explore Scientific 68° Ar Eyepiece 40mm (2")

Explore Scientific 68° Ar Eyepiece 40mm (2")
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Explore Scientific 68° Ar Eyepiece 40mm (2")
Ex Tax: £240.83
  • Stock: Ask About Stock
  • Model: ES-0218640
  • Shipping Weight: 1.80kg
  • SKU: ES-0218640
  • GTIN: 4007922200217
  • MPN: ES-0218640

40mm Argon purged high performance Explore Scientific 2" eyepiece with 68° apparent field


  • Waterproof, Argon purged and sealed against dust
  • Large and sharp 68° field
  • EMD-fully multi-coated with blackened lens edges
  • All eyepieces of this series are parfocal


With the introduction of the 68° Series we are pleased to make two important improvements in eyepiece manufacture, the first being 15 layer Enhanced Multi-layer Deposition (EMD) coatings on all glass-to-air surfaces to gain maximum contrast, and waterproofing the eyepiece with the use of Argon gas purging instead of standard Nitrogen gas. Although Nitrogen is a fine choice that will last for many years, Argon is a larger molecule that maintains its protective properties over a wider range of temperatures, and is even more resistant to diffusion thereby further extending the protective waterproof environment of the eyepiece body.

Through computer-optimized design, a careful selection of optical glasses, and enhanced multi-layer deposition coatings, the Explore Scientific 68° Series eyepieces produce long eye-relief and ensure high image-correction, a flat field, and high contrast across the entire image field. An excellent choice for those who make extended visual studies of detail with subtle variations of brightness, and for those who must wear glasses while observing.

All 68° Series eyepieces are fully EMD (Enhanced Multi-Layer Deposition) coated and edge-blackened to produce superior contrast.

Specifications of Explore Scientific 68° Ar 40mm Eyepiece
Focal length: 40mm
Eyepiece barrel diameter: 50.8mm / 2"
Length of eyepiece barrel: 31mm
Waterproof: yes
Nitrogen or Argon purged: yes
Foldable rubber eyecups: yes
Construction: 6 lenses in 4 groups
Weight: 1236g


General Information
Weight in Kg1.8

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