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You want to compare the limiting magnitude of different lens. You claimed that the star image on the CCD is always minimal (therefore the aperture is the only factor), but I try to prove that is not always the case.
The main problem is that the optical systems are not perfect. The inferior system projects light from a point source onto a much larger area on the CCD.Wah!! 寫:上面討論的是攝影系統的極限星等, 而極限星等的星, 在感光器上的成像都是佔最小面積的.