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To ensure a beacon detectability across the field of view, the lens system needs to maintain a high brightest pixel flux fraction at various field angles, often achieved by multiple-element lens system so that aberrations can be corrected.
The brightest pixel flux fraction (BPFF) parameter was used to evaluate the level of focus in each case.
The BPFF is defined as the ratio of the photon flux in the brightest pixel to the total photon flux distributed in the PSF.
The maximum BPFFs are shown in Figure 3-4(a.2) and 3-4(b.2), corresponding to the on-axis and off-axis case.
While there are aberrations in the off-axis case causing PSF distortions, the off-axis BPFF stays relatively close to the on-axis case, ensuring relatively constant signal-to-noise ratio across the field during acquisition.
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