All Metal FMC Astronomical Telescope PL4mm Eyepiece
[Focal length]: 4mm focal length, high output eyepiece
Size: Standard 1.25 inch / 31.7 mm astronomical telescope general accessory.
[Coating]: FMC full multi-layer broadband coating, high resolution.
[Functions]: All metal, 1.25" filter can turn on bottom mat thread, laser lettering, and fast spiral box package.
[Applicable]: Suitable for all astronomy telescopes (31.7mm interface) used for surface astronomical observation, dual-purpose space and clusters of planets, nebula, stars, binocular nebulas and other celestial bodies, high brightness, large field of view, very comfortable observation. Metal mirror body, multi-layer coating across the entire surface, high quality optical performance