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[Preprint]. 2023 Jan 4:2023.01.04.522767. [Version 1] doi: 10.1101/2023.01.04.522767

Figure 2: GVA dynamic range, but not accuracy, depends on the optical configuration.

Figure 2:

a) Picture of assembled pipette tip holder on an iPhone 12 with a Xenvo macro lens. The pipette images are taken in front of a white backdrop (paper) with ambient illumination. b) Example images of the same 2 pipette tips using the Canon EOS with 100 mm f2.8 macro lens (left) or the iPhone 12 with Xenvo macro lens (right). The GVA calculated CFUs/mL are reported below. Selected colonies for GVA calculation are circled. c) Dynamic range of the iPhone GVA. E. coli were diluted 4X and embedded in pipette tips. After incubation, the same tips were imaged with the iPhone camera with macro lens (green) and the mirrorless camera (purple). Points are the mean of 4 replicates calculated after taking the log. Green and purple lines are the linear regression fit to the dilution series. d) Pearson correlation between iPhone GVA and professional camera for all pipettes where colonies could be counted using both. Correlation coefficient calculated in log-space.