Figure 4
From: Contact Angle Measurement of Small Capillary Length Liquid in Super-repelled State
Comparisons of measured contact angles of FC-72 at different zooms with water as a reference. Without zoom, there is ~10° contact angle deviation of FC-72 due to blur that causes an inaccurate meniscus detection. With virtual zoom, the image was digitally scaled but provides fewer points for calculation, leading to more scattered data. With physical zoom, the meniscus was better resolved and showed accurate contact angle while the data scattering was caused by local contact angle variation from a relatively large wavelength of the surface roughness.
