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Excellent Color Correction "ED-2" stands for "Extra-low Dispersion" optical glass in which two of the lens elements are crafted from the ED glass (hence, ED-2), this is a special grade of glass that provides superior refractive properties when compared to standard optical glass. ED glass is the same type of glass that is used in many expensive camera lenses and high-end refractor telescopes costing several thousand dollars!
These 1.25" eyepieces feature a six-element lens design which helps to provide the 20mm of eye relief with remarkably reduced chromatic aberration and excellent sharpness. So even if you wear spectacles the long eye relief means that, you can take in the full field of view which is a generous 55°.
Fully Multi-Coated These ED-2 eyepieces are fully multi-coated (every air-to-glass lens surface is multi-coated) for maximum image brightness, and the lens edges are blackened for improved contrast. The eyepiece housings are precision machined from aluminum and clear-anodized to a lustrous finish. A black rubber traction ring ensures a secure grip, and a soft rubber eyeguard helps position your eye and block out stray light. The barrels feature a setscrew recess for added security, and they're threaded on the inside to accept 1.25" filters. Each eyepiece comes with two end caps and a durable plastic case.
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