Celestron 25mm Kellner volcano top 1.25" eyepiece. Japanese made, circle dash optics mark (COSMETIC UGLY)-GLASS GOOD

(COSMETIC UGLY)-GLASS is GOOD

The Celestron 25mm Kellner Volcano Top 1.25" Eyepiece is an accessory designed for use with telescopes, particularly those with a 1.25-inch eyepiece barrel. Produced by Celestron, a well-known manufacturer of telescopes and accessories, this eyepiece is part of their line of Kellner eyepieces.

The Kellner eyepiece design is a type of optical configuration commonly used in telescopes. It typically consists of three lens elements arranged in two groups. While not as complex as some other eyepiece designs, Kellner eyepieces like the Celestron 25mm still offer decent image quality, making them suitable for general astronomical observation.

The "Volcano Top" designation likely refers to the distinctive appearance of the eyepiece, with a raised top resembling a volcano. This design can make it easier to handle the eyepiece, especially when wearing gloves or observing in cold conditions.

Being Japanese-made, this Celestron eyepiece likely benefits from the reputation Japanese manufacturers have for producing high-quality optical equipment. Japan has a long history of precision optics manufacturing, and products made there often carry a certain level of quality and craftsmanship.

With its 25mm focal length, this eyepiece provides moderate magnification, making it suitable for a variety of celestial objects, from large extended nebulae and star clusters to smaller planetary details. It's a versatile eyepiece that can be a valuable addition to any amateur astronomer's collection, offering good performance and reliability for observing the wonders of the night sky.