Archive for the 'telescope' tag

Exit Pupil

The exit pupil is the image formed by the...
Read more

Eyepiece

An eyepiece is the combination of lenses that...
Read more

Doublet

A lens that comprises two elements glued together...
Read more

Declination

The angle north or south of the celestial equator...
Read more

Dark Adapted

This is what every astronomer’s eyes should...
Read more