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Fig. 6
Vignetting coefficients as a function of the polar angle for L2 = 310 mm, L1 = 300 mm, 
= 290 mm, 
= 280 mm, α0 = 0.3 deg, δ = 0 deg, θ = 0.25 deg, Φ = 0.43 deg, Ψ = 0.4 deg, and Σ = 0.408 deg. We also plot V, the vignetting factor for double reflection (Eq. (6)).
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