Nikon H.K.W. 10x U Bi D eyepiece + reticle (25mm FL and 23,2mm barrel)
Introduction: After many years and now focused on CCD observations, I plan to sell my personal collection of rare and high resolution eyepieces. Most come from microscope world and are tested to perform very good to excellent as "relay eyepieces" (eyepiece projection technique), but most work visually great too. These belong to *the best* after testing indoors with Imatest software and controlled enviroment with a modern Catadioptric telescope design. You are garanteed these can perform great as planetary/lunar eyepieces, even exceeding some top planetary eyepieces.You can see the report here: https://www.marronyazul.es/azul/how.htm (click on the PDF of the test entitled "A new approach for testing optical trains").
Description: Excellent eyepiece for low magnification and visual. This is a 23,2mm barrel eyepiece which needs a 23,2mm to 1,25" adapter to use on telescopes (I sell them in my shop). LENSES are absolutely nice with no haze or scratches. It may show some normal usage marks in BODY. It has some cleaning marks in front lens ("cleaning marks" are never discernable when viewing through, they are not "scratches per se", but "micro-scratches" instead, only seen when exposed under strong light). It has retractable metal eyecap. It has crossed reticle (very clean, BTW). Rare eyepiece.