Exit-Pupil on Startgaze — Astronomy, Stargazing & Space Sciencehttps://www.startgaze.com/tags/exit-pupil/Recent content in Exit-Pupil on Startgaze — Astronomy, Stargazing & Space ScienceHugoen-usTue, 14 Jul 2026 07:36:30 +0000Your first two eyepieces: what focal length and exit pupil actually meanhttps://www.startgaze.com/posts/2026-07-14-first-two-eyepieces-focal-length-exit-pupil/Tue, 14 Jul 2026 07:36:30 +0000https://www.startgaze.com/posts/2026-07-14-first-two-eyepieces-focal-length-exit-pupil/Your telescope came with a 25mm and a 10mm eyepiece. Here's what focal length and exit pupil really do, and which two to add first without brand hype.