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Single-pixel camera (SPC) is an alternative architecture for imaging systems that emerged as an application of the compressive sensing theory. The SPC’s distinctive feature is the single detector that measures the linear combinations of pixels instead of pixels as in imaging array cameras. The measurements are obtained by projecting the scene on a spatial light modulator (SLM), the other distinctive component of the SPC architecture. This paper discusses the problem of resolution in SPC. We show that in terms of point spread function (PSF), the resolution model is similar to that of an imaging array camera except the fact that the role of the imaging array is taken over by the SLM. This reduces the contribution of the optics to the SPC resolution comparing with the CCD cameras. Relying on an existing method, we develop a procedure that uses a circular chart to measure the camera PSF. Our procedure has additional facilities: the correction of chart tilt and the capability to work with non-circular apertures. At low noise, tilts up to 15° are practically removed. [ABSTRACT FROM AUTHOR]