Polaris 1 25mm calibration and guiding eyepiece, T-2 (illuminated)

The smaller the focal length of an eyepiece, the higher the magnification when used with a telescope.

This is the angle of aperture of an eyepiece.

The optical elements are treated with ultra-thin coatings. Among others, there are anti-reflective coatings for reducing, and dielectric coatings for increasing reflection.

Used to connect a filter to the accessory.

Eyepieces are important accessories for every telescope.