Feature:1. Blue Film Coating: The lens adopts high grade optical glass, full broadband coating(blue film), which perfectly matches the optical advantages of modern lenses to obtain clear imaging.2. T2 Mount Interface: The eyepiece can be used in combination with a variety of T2 lens or telescopes, high power telescopes, viewing the full erect image, infinite distance focusing.3. Material: Made of high quality alloy + optical glass material, small in size, light in weight, portable, only occupies a corner of the camera bag, easy to carry around with you.4. Better Viewing Effect: Relative to the camera's viewfinder, the higher the effect, the better the viewing effect. Telescope eyepiece focal length is 25mm/1.0in, eyepiece interface is T2 mount, lens structure is 4 pieces in 2 groups.5. Principle of Eyepiece: The telescope eyepiece is equivalent to a magnifying glass, and the real image formed by the objective lens is within the focal length of the eyepiece, so it becomes a virtual image that is upright magnified, and the distant scene can be seen.6. Eyepiece Function: The main function is to magnify the real image obtained by the objective lens magnification again. In order to eliminate aberrations, the eyepiece is usually composed of several lenses, which have a larger field of view and angle of view magnification.Specification:Item Type: EyepieceMaterial: Alloy + Optical GlassInterface: T2 MountEyepiece Focal Length: Approx. 25mm/1.0inLens Structure: 4 Pieces in 2 GroupsCoating: Blue FilmColor: As Pictures ShownWeight: Approx. 144g/5.1oz.Package List:1 x Eyepiece