The Basics of Telescope Design 🔭

3-Second Blueprint (English)

1. Galilean refractors pair a convex objective with a concave eyepiece spaced at f1 - f2, yielding modest magnification and edge error.
2. Keplerian refractors use two convex lenses spaced at f1 + f2 for stronger magnification and lower aberration but a narrow field.
3. Modern telescopes favor reflecting mirrors over lenses to minimize light loss and optical edge distortions.