Orion 30mm Ultrascopic Eyepiece 1.25" (08562)
The Orion 30mm Ultrascopic Eyepiece is invented in Japan by one of its most respected optical designers - features lens elements manufactured to exact tolerances and to a higher degree of polish than competitive models. It is a state-of-the-art 5-element design using modern high-refractive-index glasses, resulting in flat-field images superior to those of simpler 4-element Plossl and orthoscopic designs.
The wide 52° apparent field of view is a pleasure to behold. While some manufacturers "fully multi-coated" eyepieces have a single layer of magnesium fluoride on most lens surfaces and multi-coatings only on the outer exposed surfaces, this is not the case with this eyepiece. This Orion Ultrascopic eyepiece doesn't skimp on coatings. It is Ultra Multi-Coated, which means that every air-to-glass lens surface is vacuum coated with multiple antireflective layers.
Ultra Multi-Coating is the highest level of multi-coating there is. The superior coatings dramatically improve both brightness and contrast, increasing the visibility of faint nebulas, planetary details - anything you view with your telescope. A low-reflection barrel design with blackened lens edges provides a significant increase in contrast and a reduction of stray reflections. Each Ultrascopic eyepiece is parfocal, so you need only minimal refocusing when switching powers (except for the 35mm, optimized for the widest field possible in a 1.25" barrel). It has standard filter threading.