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Telescope - Coggle Diagram

- - - - refraction and reflection
      - Focus(foci)
        
        $$ S = F tan(\theta)\approx F \theta$$
      - Lens
        
        Prime focus
        
        and R-C (Ritchey-Chrétien)Cassegrain
        
        Newtonian
        
        Gregorian
        
        Schmidt-Cassegrain
        
        Schmidt Camera
      - Focus
        
        Primary
        
        Cassegrain
        
        Nasmyth
        
        Coude
      - Diameter
    - - Equatorial
      - alt-az
- - - - FWHM
      - Diffraction(衍射）
      - Airy Disk $$\theta_{min}\approx1.22\frac{\lambda}{d}$$
      - Rayleigh Criterion and Angular Resolution
      - Gaussian PSF
        
        $$ 2.35\times\sigma$$
  - - - $$ P_s=\frac{\theta}{S} = \frac{1}{F}$$
      - Limiting Magnitude
        
        $$m_v = m_v'+5lg\frac{D}{d_{eye}}+2.3lgk$$
        
        $$m_v'=2.1mag+5lgD (D@mm)$$
        
        $$m_{film}=-2.5log_{10}D+2.5log_{10}t+C$$
      - Focal Ratio
        
        $$E~~D^2$$$$Perarea~~S^2~~F^2$$
        
        $$R=\frac{F}{D}$$written as f/[R] e.g f/2.8
        
        f/R small f/R = fast exposure and smaller plate scale
      - FOV
        
        $$FOV=2tan^{-1}(\frac{\omega}{2f})$$
        
        Vera Rubin
- - - - Poisson Distribution
      - $$Longer~~ \rightarrow greater~~ SNR$$