Size:K4mm Product Description: GazerOptics 4mm Kellner eyepiece is a great choice for astronomical observation. Fully Coated Optical Lens All eyepiece elements are Fully Coated for additional light transmission, greatly improves the clarity of the edge images. Long Eye Relief Nice eye relief lets you view the entire field comfortably, especially for eyeglass wearers.  1.25" eyepiece interface Threaded for any standard 1.25inch astronomy filters and barlow lens. Sturdy plastic dust cover Comes with sturdy plastic bucket to protect the eyepiece from dust and moisture. Specifications: Optical Design: 3 elements Focal Length: 4mm Apparent Field of View: 45 degree Filter threads: Standard 1.25" filter thread Material: Metal   P.S: For any reason you are unhappy with any product by us, please do not hesitate to contact us. We take full ownership and responsibility for the quality of our products and will do best to solve your problem quickly and efficiently. Any suggestion will be warmly welcomed.
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