Fourier Ptychography is a computational imaging technique able to decouple high resolution from wide fieldof view, bypassing the diraction limit of the microscope. Since it does not rely on high precision mechanicsor uorescent imaging, it is of practical interest for implementation in low scale devices. Despite its gains,realizing a functional low-cost setup working at the theoretical limits is challenging due to many factors causingdiscrepancies between theory and practice. Misalignment of the light emitting diode array (LED-array), opticalsystem aberrations and use of partial coherent sources are common issues which have been addressed withcalibration algorithms. However, physical interpretation of how these factors inuence the algorithm and causemismatches between theory and practice has had little attention so far. This work provides a discussion basedon simulation results on the eect of the partial coherence of the source. From obtained results, an optimal setof LEDs for data acquisition is described which avoids degeneracy caused by partial coherence and is based onthe numerical aperture (NA) of the objective and source parameters such as bandwidth and size.
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