多謝2L回復(fù),您指的應(yīng)該是這段吧
^`W8>czi “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.
,9(=Iu-?1 peA}/Jc Generally speaking, the spot diagram is useful if the aberrations are large compared to the diffraction limited performance of the system.”
lw.4O^ (