Extended Diopter Lens Tube

This extended metal diopter tube is designed for NightCrystal M6, M5, M4, and M3 night vision scopes. By replacing the original eyepiece sleeve, it increases the adjustable diopter distance from 6–7.5 cm to 8.5–10 cm, allowing users with strong farsighted vision to clearly view the screen without wearing reading glasses. Ideal for hunters who need fast, clear vision in the field.