EXPLORE SCIENTIFIC 68° Ar Eyepiece 20mm (1.25")

20mm high-performance argon-purged eyepiece with 68° apparent field of view

• Waterproof, argon purified and dust sealed
• Wide and sharp field of 68°
• EMD-fully multi-coated with blackened lens edges
• All eyepieces in this series are parfocal.
• Dimensions and specifications of all eyepieces can be found in the PDF file in the "media" folder.

With the introduction of the 68° Series, we are pleased to make two significant improvements in eyepiece manufacturing, the first being 15-layer Enhanced Multi-Layer Deposition (EMD) coatings on all glass-to-air surfaces for maximum contrast, and waterproofing the eyepiece with the use of argon purged gas instead of standard nitrogen gas. While nitrogen is a good choice that will last for many years, argon is a larger molecule that maintains its protective properties over a wider temperature range and is even more resistant to diffusion, thus providing broader water protection to the eyepiece body.

Through computer-optimized design, careful selection of optical lenses, and reinforcement with multi-layered deposition coatings, the Explore Scientific 68 Series eyepieces provide a long pupil-to-eyepiece distance and ensure high image correction, a flat field of view, and high contrast across the entire image field. An excellent choice for those making long, detailed visual studies with subtle variations in brightness, and for those who must wear eyeglasses while observing.

The 68° Series eyepieces are fully EMD (Enhanced Multi-Layer Deposition) and dark-edged to produce superior contrast.

Specs: