Description: This telescope eyepiece offers a 50o apparent field of view, perfect for the moon, planets, and deep-sky objects. The premium optical eyepiece is finished with multiple layers of high-transmission coatings for clear images. The for edges of the for optics are for blackened for increased contrast.Finish that resists reflections and glare. The eyepiece's body is made of aluminum. A two-step anodizing process results in a beautiful matte. The eyepiece includes a black rubber eyecup. It can be left up or folded down for better observations while wearing eyeglasses. Specification: Lens material: Resin. Color: As picture shown TYPE1 :Focal Length:4 mm (0.16 in) Apparent Field of View:50 ° Eye Relief (mm):6 mm (0.24 in) Number of Lens Elements:4 for Barrel Size (in):1.25 in (32 mm) type 2 Focal Length: 6 mm (0.24 in) Apparent Field of View :50 ° Eye Relief (mm) :5 mm (0.2 in) Number of Lens Elements :4 for Barrel Size:(in) 1.25 in (32 mm) type 3 Focal Length:9 mm (0.35 in) Apparent Field of View:50 ° Eye Relief (mm):6 mm (0.24 in) Number of Lens Elements:4 for Barrel Size (in):1.25 in (32 mm) type 4 Focal Length 12 mm (0.49 in) Apparent Field of View 50 ° Eye Relief (mm) 8 mm (0.31 in) Number of Lens Elements 4 for Barrel Size (in) 1.25 in (32 mm) type 5 Focal Length:15 mm (0.59 in) Apparent Field of View:50 ° Eye Relief (mm):13 mm (0.51 in) Number of Lens Elements:4 for Barrel Size (in):1.25 in (32 mm) type 6 Focal Length:32 mm (0.16 in) Apparent Field of View:52 ° Eye Relief (mm):22 mm (0.24 in) Number of Lens Elements:4 for Barrel Size (in):1.25 in (32 mm) type 7 Focal Length:40 mm (1.57 in) Apparent Field of View:43 ° Eye Relief (mm):31 mm (1.22 in) Number of Lens Elements:4 for Barrel Size (in):1.25 in (32 mm) Note There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included: 1x Eyepiece. 1x Lens cover.