Nikon 10x/21 high resolution eyepiece (focal length 25mm and 30mm 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: Though it has no "Nikon" lettering on it, this is a proud Nikon eyepiece. This is a 30mm barrel eyepiece which needs a 30mm 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 marks in BODY.