Figure shows the effects of decreasing dp from 305 nm to 35 nm in 40 nm increments with a fixed P of ~0.0002. Transparency clearly increases across the window as dp decreases, where the pore scattering effects are significantly stronger near the perovskite band edge as compared to longer wavelengths. The data in Figure assumes monodisperse dp. However, in reality, dp is polydisperse (see Figure ). We thus adapt our model to include the pore size distribution derived from NanoCT and track changes to the spectra as a function of P (see Figure for a comparison of monodisperse vs polydisperse models). Figure illustrates this data as a function of decreasing P between 0.0001<P<0.001. The porosity that best matches the experimental data is ~0.0002, Overall, the modelling makes it apparent that P<0.0001 and dp<100 nm are ideal for optimal transparency in ~1 mm thick perovskite ceramics.