Celestron Luminos Eyepieces - 1.25" Size:19mm which is very critical for

which is very critical for high-power viewing

This allows the Etalon surfaces to always remain at the same perfect angle to the light waves but changes the diffractive index of the air in the chamber and thus accomplishes the same tuning expect that it goes around + or - 0

81 and focal length of 1500 mm (59

They can be considered "focal reducers" for eyepieces

Bonus Autostar Suite Astronomy planetarium DVD with over 10

Celestron Luminos Eyepieces - 1.25" Size:19mm which is very critical forAbout the Celestron Luminos Eyepiece 1. 25" The Celestron Luminos Eyepiece has a beautiful 82 degree field of view and offers a full range of viewing in comfort at a great price. What''s more, exceptional eye relief makes even eyeglass wearers happy! The Celestron Luminos Eyepiece 7 element fully multi coated optics are sharp and crisp. Experience excellent color correction and contrast! You'''ll enjoy features like a rubber grip ring, a hard anodized