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Optical Telescopes - Coggle Diagram
Optical Telescopes
Foci
Prime focus
Newtonian focus
Cassegrain focus
Nasmyth focus
Coude focus
Other visual accessories
star diagonal
Barlow lens
erecting lens
finder
crosswires
Angular Resolution
Airy disk
Diffraction rings
Rayleigh criterion
Dawes limit
Aberrations
chromatic aberration
lateral chromatic aberration
spherical aberration
off-axis aberration
coma
astigmatism
distortion
field curvature
vignetting (sometimes)
Basic principles
Two fundemental principles: refraction & reflection
Refraction: Snell's law
Reflection: Law of Reflection
Focal length, image scale and focal ratio
Focal point & Focal length
Plate or image scale: how many arcsec of sky fall on each pixel
Focal ratio
Types of Telescope
Refractors
singlets
doublets
achromatic doublets
triplets
Apochromatic triplets
Reflectors
Newtonian
Gregorian
Cassegrain
Classical Cassegrain
Ritchey-Chretien
intrinsically smallest aberration
Dall-Kirkham
Compound
Schmidt-Cassegrain
Maksutov-Cassegrain
Eyepieces
Magnification
Exit Pupil
Eye relief
Surface Brightness and Image Brightness
Surface brightness
brightness per unit area for an extended object
Image brightness
the surface brightness of the object
the surface brightness of the background sky
the focal ratio of the telescope
Telescope Mounts
alt-az
Equatorial
German type
English yoke
English cross-axis
Fork
Field of view
Apparent field of view
True field of view
Collecting Light
Light gathering power (LGP)
Diameter
Amount of time it takes to collect a given amount of light
Limiting Magnitude