1. 68 degree ultra-wide field of view provides a wide view of the moon, star clusters 2. Multi-element design provides sharp images with good color correction and contrast 3. The inside of the lens barrel is blackened to eliminate light scattering 4. Threaded for mounting 1.25 inch filters 5. Focal length: 6mm 6. Barrel size: 1.25 inch (31.7mm) 7. Field of view: 68 degrees 8. Coating: full multilayer broadband 9. Visual distance: 17mm 10. Structure design: 3 groups of 5 elements 11. Lens material: optical glass lens 12. Body material: all metal 13. Filter thread: standard 1.25 inch filter thread 14. Net Weight: about 133g
