EXPLORE SCIENTIFIC 68° Ar Eyepiece 28mm (2")
28mm Argon purged high performance 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
- Dimensions and specifications of all eyepieces can be found in the pdf in the folder "media"
Technical Data
OPTICAL SPECIFICATIONS |
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Focal length | 28 mm |
Apparent field of view | 68 degrees |
Lenses/Groups | 6/4 |
GENERAL TECHNICAL DATA |
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Waterproof8 | ✓ |
Eyepiece Barrel Diameter | 50.8 mm |
Eyecups | Rubber eyecups, foldable |
Extended warranty | 10 years |
DIMENSIONS & WEIGHTS |
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Net weight (without access.) | 475 g |
Length of the eyepiece barrel | 31 mm |
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.