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Telescopes - Coggle Diagram
Telescopes
Quantify the Performance
Light Gathering Power
Plate Scale: converting angular size into image size
Focal Ratio: Focal length / Diameter
Point Spread Function (PSF)
Angular Resolution
Airy Disk
Rayleigh Criterion
Diffraction Spikes
Field of View (FOV)
FWHM and Seeing
Adaptive Optics
Active Optics
Basics
Assumption & Basic Setup
Assumptions
Parallel rays of light: Astronomical objects are far away. So we assume plane parallel waves.
Point source
Basic Optics
Reflection
Refraction
Foci (Focus Point)
Optics and Mounts
Types of Telescope
Mirrors
Spherical
Parabolic
Hyperbolic
Newtonian
Cassegrain
Classical: Parabolic primary
Ritchey-Chretien (R-C): both hyperbolic surfaces
Schmidt-Cassegrain and Schmidt Camera
Gregorian
Types of Focuses
Prime Focus (F1)
Cassegrain Focus (F2)
Nasmyth Focus (F3)
Coude Focus (F4)
Types of Mounts
Alt-Az
Equatorial
Aberrations
Definition: Imperfections that exist even with the perfect optics
Chromatic Aberration
On-axis Aberration
Spherical Aberration
Off-axis Aberration
coma
astigmatism
Distortion, Field curvature and Vignetting
SNR
Poission Distribution
Signal-to-Noise Ratio
Long exposure to boost SNR