多谢2L回复,您指的应该是这段吧 VnqcpJ
“On axis, the spot is much smaller than the Airy Disk, while off axis the spot is much larger than the Airy Disk. This indicates the spot diagram is a useful and reasonable indicator of performance off axis only. To compute a more accurate PSF both on and off axis, a consideration of diffraction will be required. L=<$^ m
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Generally speaking, the spot diagram is useful if the aberrations are large compared to the diffraction limited performance of the system.” .}GOHW)}
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我大概晓得了,多谢帮助!待我把您给的这篇看完,有问题再来问:)